keeping males and females together

After the eye's open I wait a week and then put all the weinlings in a holding tub together, males and females. At two weeks with their eyes open I separate males and females into their own tubs. But now I'm leaving on a holiday so how long can I keep the sexes together? The day I leave is the day all the weinlings will be pulled from there parents and housed together (7 days after their eyes are opened).

many people keep them together all the time without issue.