Here's a base code frame that you can use to make a timer.
color changes the color combination in the application file
timeout set the time in seconds
the :1 and the goto 1 loops the timer so that it stops and resets so you can start it again with a press of a button.
the @ehco off keeps the app from putting other stuff on the app screen to keep it clean and simple.
save the file as a text file ".txt" in the desired location.