How do I create a countdown timer from 40h60m60s

Hello Constructors,

I've had a look online and found this:

Global number: timer = 0

Every tick-- Append Text: floor(gametime/3600)&"h" & floor(gametime/60%60)&"m"&floor(gametime%60)&"s"

I'm looking for a slower, more natural timer... some that starts 40h60m60s and counts down on the minute/seconds.

should I use Timer behaviour?

Thanks,

Roberto