Timer showing time left for stig

erm is it possible for anyone to make a timer that can show the time left for stig coz i have a really bad sense of time. oh and can it have an option so i can just press a button and the timer resets immediately?

or if anyone knows how to make it using AutoHotKey, pls teach me how or tell me the code for it ^^

thx in advance

xx=40
loop
{
TrayTip, Timer, %xx%, 20, 17
sleep 1000
envsub, xx, 1
}

^q::reload