cnt := 0
SetTimer, countup, 1000
SoundPlay, *-1
sleep, 1800000
SetTimer, countup, Off
SoundPlay, *16
msgbox, 30min
return

countup() {
global cnt
cnt++
}

F1::
ToolTip % cnt // 60 " min " Mod(cnt, 60) " sec"
sleep 100
; KeyWait "F1"
return
F1 up:: ToolTip