Thread delay help (threadindex*sleep)

[iamatx]

I used thread index* sleep to put delay in my thread
But it's not effective
If am running 100 thread delay of 30sec-1 min
Then when my thread 100 complete it's task
It gonna restart after 100min
I want it to start after min or
Minute after last thread start that will be awesome

[HELP_ME]

Try: If thread index * sleep > (certain number)
Make it sleep for a random amount of time (few minutes)