You can also define an end of scenario screen using CfgDebriefings or pick from one of the predefined ones. When the trigger activates, the module will initialize and start the countdown. You define the countdown time and synchronize the module to a trigger. Simplest way is to use the BIS module Countdown.
Here you can put any command to be fired after the zero count, ex: NameTank SetDamage 1. Sorry, i know i'm still learning with this stuff. What a simple way for once this trigger is activated you have 7 minutes to get to this trigger? More about scripting? This way Scripting introduction for new scripters. I need a countdown timer for my mission, i'v had a search but it confuses me.