LOL!
That's pretty standard for rat breeding. It all happens very very fast.
The male mounts the female and does a few quick thrusts then dismounts. He then will clean his goods for a few seconds then try to mount the female again. The females will hop around enticing the male to mount them and arch their backs. Their ears will wiggle too, but not easy to see.
Females go into heat ever 4 days, so it's safe to say that 1-2 weeks is enough time to leave the male in. (If they are both sexually mature)
I personally leave them in for 2 weeks just to make sure.
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