Tip for wait action ?

I have a trigger, periodic time, how can i change that time ? Lets take survivor map where every couple of times different waves are spawned. So each spawn has like 2 second cooldown before next unit will be spawned, but how can i change for next wave that cooldown from 2 seconds to lets say 3 seconds ? I tried to set variable, and periodic time is 1 second always, at the top of actions is wait=(variable)seconds => wont work.
Also wait wont work inside If Then Else actions... so ? Any solution ?

This should be under Triggers and Scripts.

Are you using GUI?

You make triggers that are initially on with periodic timers that suit your periods and then turn them on when u need them or off when you don't need it.

Wait works fine inside If/Then/Else blocks. It doesn't work in loops, IF, and only IF there can be more than one loop running at the same time. If not, it should work.

Wont work, event is "every 2 seconds".

Use a timer expires event instead of a periodic event. You can pause the timer as much as you want, and you can start it with different intervals.