Reduce duration of power button press when reflashing

Development_Environment/Phone/Troubleshooting/Reflashing_the_Phone.rst

@@ -88,7 +88,7 @@ Not doing these steps in this order could cause the flashing to fail:
 
  #. Disconnect the USB C cable.
  #. Press and hold the Volume Up button. Keep it pressed.
- #. Press and hold the power button for 18 seconds.
+ #. Press and hold the power button for 16 seconds.
  #. Release the the power button.
  #. Release the Volume Up button.
  #. Plug one end of the USB C cable into your workstation.