I also pay attention to who's doing what--a female that is locking with males will get the male put back with her frequently. If there's no locking going on from the female, but the male is going with other girls, then after a few tries, I'll wait until she sheds and try again then.

If the boy's not locking with any girls, he gets 3 days off before trying again--no breeding activity that night, then he's back in his bin for another 3 days.

How much time off a female gets depends on how many females the male I'm using for her is seeing--but she gets at least two days off per week to eat and digest.