Apply SEC_TO_MS and other fixes

Marlin/src/gcode/control/M80_M81.cpp

@@ -89,9 +89,10 @@
  */
 void GcodeSuite::M81() {
   thermalManager.disable_all_heaters();
-  print_job_timer.stop();
   planner.finish_and_disable();
 
+  print_job_timer.stop();
+
   #if HAS_FAN
     thermalManager.zero_fan_speeds();
     #if ENABLED(PROBING_FANS_OFF)