diff --git a/Firmware/Configuration_adv.h b/Firmware/Configuration_adv.h
index 7a9a4929a..ee12716e6 100644
--- a/Firmware/Configuration_adv.h
+++ b/Firmware/Configuration_adv.h
@@ -338,6 +338,11 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 // Control heater 0 and heater 1 in parallel.
 //#define HEATERS_PARALLEL
 
+//LCD status clock interval timer to switch between
+// remaining print time
+// and time to change/pause/interaction
+#define CLOCK_INTERVAL_TIME 5
+
 //===========================================================================
 //=============================Buffers           ============================
 //===========================================================================
diff --git a/Firmware/Marlin.h b/Firmware/Marlin.h
index cbe03c0f6..a1b6fe4eb 100755
--- a/Firmware/Marlin.h
+++ b/Firmware/Marlin.h
@@ -366,6 +366,8 @@ extern uint8_t print_percent_done_normal;
 extern uint16_t print_time_remaining_normal;
 extern uint8_t print_percent_done_silent;
 extern uint16_t print_time_remaining_silent;
+extern uint16_t print_time_to_change_normal;
+extern uint16_t print_time_to_change_silent;
 
 #define PRINT_TIME_REMAINING_INIT 0xffff
 
@@ -437,7 +439,6 @@ extern void cancel_saved_printing();
 
 
 //estimated time to end of the print
-extern uint16_t print_time_remaining();
 extern uint8_t calc_percent_done();
 
 
diff --git a/Firmware/Marlin_main.cpp b/Firmware/Marlin_main.cpp
index 0c468189b..c23a1c15a 100755
--- a/Firmware/Marlin_main.cpp
+++ b/Firmware/Marlin_main.cpp
@@ -316,6 +316,8 @@ uint8_t print_percent_done_normal = PRINT_PERCENT_DONE_INIT;
 uint16_t print_time_remaining_normal = PRINT_TIME_REMAINING_INIT; //estimated remaining print time in minutes
 uint8_t print_percent_done_silent = PRINT_PERCENT_DONE_INIT;
 uint16_t print_time_remaining_silent = PRINT_TIME_REMAINING_INIT; //estimated remaining print time in minutes
+uint16_t print_time_to_change_normal = PRINT_TIME_REMAINING_INIT; //estimated remaining time to next change in minutes
+uint16_t print_time_to_change_silent = PRINT_TIME_REMAINING_INIT; //estimated remaining time to next change in minutes
 
 uint32_t IP_address = 0;
 
@@ -6391,31 +6393,37 @@ Sigma_Exit:
 #endif		// Z_PROBE_REPEATABILITY_TEST 
 #endif		// ENABLE_AUTO_BED_LEVELING
 
-	/*!
-	### M73 - Set/get print progress <a href="https://reprap.org/wiki/G-code#M73:_Set.2FGet_build_percentage">M73: Set/Get build percentage</a>
-	#### Usage
+    /*!
+    ### M73 - Set/get print progress <a href="https://reprap.org/wiki/G-code#M73:_Set.2FGet_build_percentage">M73: Set/Get build percentage</a>
+    #### Usage
     
-	    M73 [ P | R | Q | S ]
-    
-	#### Parameters
-    - `P` - Percent in normal mode
-    - `R` - Time remaining in normal mode
-    - `Q` - Percent in silent mode
-    - `S` - Time in silent mode
-   */
-	case 73: //M73 show percent done and time remaining
-		if(code_seen('P')) print_percent_done_normal = code_value();
-		if(code_seen('R')) print_time_remaining_normal = code_value();
-		if(code_seen('Q')) print_percent_done_silent = code_value();
-		if(code_seen('S')) print_time_remaining_silent = code_value();
+        M73 [ P | R | Q | S | C | D ]
 
-		{
-			const char* _msg_mode_done_remain = _N("%S MODE: Percent done: %d; print time remaining in mins: %d\n");
-			printf_P(_msg_mode_done_remain, _N("NORMAL"), int(print_percent_done_normal), print_time_remaining_normal);
-			printf_P(_msg_mode_done_remain, _N("SILENT"), int(print_percent_done_silent), print_time_remaining_silent);
-		}
-		break;
+    #### Parameters
+        - `P` - Percent in normal mode
+        - `R` - Time remaining in normal mode
+        - `Q` - Percent in silent mode
+        - `S` - Time in silent mode
+        - `C` - Time to change/pause/user interaction in normal mode
+        - `D` - Time to change/pause/user interaction in silent mode
+    */
+    //!@todo update RepRap Gcode wiki
+    case 73: //M73 show percent done, time remaining and time to change/pause
+    {
+        if(code_seen('P')) print_percent_done_normal = code_value();
+        if(code_seen('R')) print_time_remaining_normal = code_value();
+        if(code_seen('Q')) print_percent_done_silent = code_value();
+        if(code_seen('S')) print_time_remaining_silent = code_value();
+        if(code_seen('C')) print_time_to_change_normal = code_value();
+        if(code_seen('D')) print_time_to_change_silent = code_value();
 
+    {
+        const char* _msg_mode_done_remain = _N("%S MODE: Percent done: %d; print time remaining in mins: %d; Change in mins: %d\n");
+        printf_P(_msg_mode_done_remain, _N("NORMAL"), int(print_percent_done_normal), print_time_remaining_normal, print_time_to_change_normal);
+        printf_P(_msg_mode_done_remain, _N("SILENT"), int(print_percent_done_silent), print_time_remaining_silent, print_time_to_change_silent);
+    }
+        break;
+    }
     /*!
 	### M104 - Set hotend temperature <a href="https://reprap.org/wiki/G-code#M104:_Set_Extruder_Temperature">M104: Set Extruder Temperature</a>
 	#### Usage
@@ -11653,46 +11661,40 @@ void print_mesh_bed_leveling_table()
   SERIAL_ECHOLN();
 }
 
-uint16_t print_time_remaining() {
-	uint16_t print_t = PRINT_TIME_REMAINING_INIT;
-#ifdef TMC2130 
-	if (SilentModeMenu == SILENT_MODE_OFF) print_t = print_time_remaining_normal;
-	else print_t = print_time_remaining_silent;
-#else
-	print_t = print_time_remaining_normal;
-#endif //TMC2130
-	if ((print_t != PRINT_TIME_REMAINING_INIT) && (feedmultiply != 0)) print_t = 100ul * print_t / feedmultiply;
-	return print_t;
-}
-
 uint8_t calc_percent_done()
 {
-	//in case that we have information from M73 gcode return percentage counted by slicer, else return percentage counted as byte_printed/filesize
-	uint8_t percent_done = 0;
+    //in case that we have information from M73 gcode return percentage counted by slicer, else return percentage counted as byte_printed/filesize
+    uint8_t percent_done = 0;
 #ifdef TMC2130
-	if (SilentModeMenu == SILENT_MODE_OFF && print_percent_done_normal <= 100) {
-		percent_done = print_percent_done_normal;
-	}
-	else if (print_percent_done_silent <= 100) {
-		percent_done = print_percent_done_silent;
-	}
+    if (SilentModeMenu == SILENT_MODE_OFF && print_percent_done_normal <= 100)
+    {
+        percent_done = print_percent_done_normal;
+    }
+    else if (print_percent_done_silent <= 100)
+    {
+        percent_done = print_percent_done_silent;
+    }
 #else
-	if (print_percent_done_normal <= 100) {
-		percent_done = print_percent_done_normal;
-	}
+    if (print_percent_done_normal <= 100)
+    {
+        percent_done = print_percent_done_normal;
+    }
 #endif //TMC2130
-	else {
-		percent_done = card.percentDone();
-	}
-	return percent_done;
+    else
+    {
+        percent_done = card.percentDone();
+    }
+    return percent_done;
 }
 
 static void print_time_remaining_init()
 {
-	print_time_remaining_normal = PRINT_TIME_REMAINING_INIT;
-	print_time_remaining_silent = PRINT_TIME_REMAINING_INIT;
-	print_percent_done_normal = PRINT_PERCENT_DONE_INIT;
-	print_percent_done_silent = PRINT_PERCENT_DONE_INIT;
+    print_time_remaining_normal = PRINT_TIME_REMAINING_INIT;
+    print_percent_done_normal = PRINT_PERCENT_DONE_INIT;
+    print_time_remaining_silent = PRINT_TIME_REMAINING_INIT;
+    print_percent_done_silent = PRINT_PERCENT_DONE_INIT;
+    print_time_to_change_normal = PRINT_TIME_REMAINING_INIT;
+    print_time_to_change_silent = PRINT_TIME_REMAINING_INIT;
 }
 
 void load_filament_final_feed()
diff --git a/Firmware/ultralcd.cpp b/Firmware/ultralcd.cpp
index f8b791b0b..422566f18 100755
--- a/Firmware/ultralcd.cpp
+++ b/Firmware/ultralcd.cpp
@@ -57,7 +57,7 @@
 
 int scrollstuff = 0;
 char longFilenameOLD[LONG_FILENAME_LENGTH];
-
+int clock_interval = 0;
 
 static void lcd_sd_updir();
 static void lcd_mesh_bed_leveling_settings();
@@ -671,31 +671,85 @@ void lcdui_print_cmd_diag(void)
 // Print time (8 chars total)
 void lcdui_print_time(void)
 {
-	//if remaining print time estimation is available print it else print elapsed time
-	uint16_t print_t = 0;
-	if (print_time_remaining_normal != PRINT_TIME_REMAINING_INIT)
-		print_t = print_time_remaining();
-	else if(starttime != 0)
-		print_t = _millis() / 60000 - starttime / 60000;
-	int chars = 0;
-	if ((PRINTER_ACTIVE) && ((print_time_remaining_normal != PRINT_TIME_REMAINING_INIT) || (starttime != 0)))
-	{
-          char suff = ' ';
-          char suff_doubt = ' ';
-		if (print_time_remaining_normal != PRINT_TIME_REMAINING_INIT)
-          {
-               suff = 'R';
-               if (feedmultiply != 100)
-                    suff_doubt = '?';
-          }
-		if (print_t < 6000) //time<100h
-			chars = lcd_printf_P(_N("%c%02u:%02u%c%c"), LCD_STR_CLOCK[0], print_t / 60, print_t % 60, suff, suff_doubt);
-		else //time>=100h
-			chars = lcd_printf_P(_N("%c%3uh %c%c"), LCD_STR_CLOCK[0], print_t / 60, suff, suff_doubt);
-	}
-	else
-		chars = lcd_printf_P(_N("%c--:--  "), LCD_STR_CLOCK[0]);
-	lcd_space(8 - chars);
+    //if remaining print time estimation is available print it else print elapsed time
+    int chars = 0;
+    if ((PRINTER_ACTIVE) && (starttime != 0))
+    {
+        uint16_t print_t = 0;
+        uint16_t print_tr = 0;
+        uint16_t print_tc = 0;
+        char suff = ' ';
+        char suff_doubt = ' ';
+
+#ifdef TMC2130
+        if (SilentModeMenu != SILENT_MODE_OFF)
+        {
+            if (print_time_remaining_silent != PRINT_TIME_REMAINING_INIT)
+            {
+                print_tr = print_time_remaining_silent;
+            }
+//#ifdef CLOCK_INTERVAL_TIME
+            if (print_time_to_change_silent != PRINT_TIME_REMAINING_INIT)
+            {
+                print_tc = print_time_to_change_silent;
+            }
+//#endif //CLOCK_INTERVAL_TIME
+        }
+        else
+        {
+#endif //TMC2130
+            if (print_time_remaining_normal != PRINT_TIME_REMAINING_INIT)
+            {
+                print_tr = print_time_remaining_normal;
+            }
+//#ifdef CLOCK_INTERVAL_TIME
+            if (print_time_to_change_normal != PRINT_TIME_REMAINING_INIT)
+            {
+                print_tc = print_time_to_change_normal;
+            }
+//#endif //CLOCK_INTERVAL_TIME
+#ifdef TMC2130
+        }
+#endif //TMC2130
+
+//#ifdef CLOCK_INTERVAL_TIME
+        if (clock_interval == CLOCK_INTERVAL_TIME*2)
+        {
+            clock_interval = 0;
+        }
+        clock_interval++;
+
+        if (print_tc != 0 && clock_interval > CLOCK_INTERVAL_TIME)
+        {
+            print_t = print_tc;
+            suff = 'C';
+        }
+        else
+//#endif //CLOCK_INTERVAL_TIME 
+        if (print_tr != 0)
+        {
+            print_t = print_tr;
+            suff = 'R';
+        }
+        else
+        {
+            print_t = _millis() / 60000 - starttime / 60000; 
+        }
+
+        if (feedmultiply != 100 && (print_t == print_tr || print_t == print_tc))
+        {
+            suff_doubt = '?';
+            print_t = 100ul * print_t / feedmultiply;
+        }
+
+        if (print_t < 6000) //time<100h
+            chars = lcd_printf_P(_N("%c%02u:%02u%c%c"), LCD_STR_CLOCK[0], print_t / 60, print_t % 60, suff, suff_doubt);
+        else //time>=100h
+            chars = lcd_printf_P(_N("%c%3uh %c%c"), LCD_STR_CLOCK[0], print_t / 60, suff, suff_doubt);
+    }
+    else
+        chars = lcd_printf_P(_N("%c--:--  "), LCD_STR_CLOCK[0]);
+    lcd_space(8 - chars);
 }
 
 //Print status line on status screen