How do I make things happend in random intervals

I have a small problem. I made pickups in my game to happend every X seconds. That is ok but I would like to know how to make something happend every random seconds.

something like this:

On every ( 30sec - 60sec ) spawn 1 pickup

Just use the random expression.

Every int(random(30,60)) seconds ---> drop lewtz

Just use the random expression.

Every int(random(30,60)) seconds ---> drop lewtz

thanks