Best schedule for 4 and 2 year old

ldoo

I would love anyone's opinion on what you think is the best custody arrangement for two girls, ages 2 and almost 4. Keeping in mind that I, the mom, have always been the main custodian. But they sure do love their daddy, so that's not an issue. And we live only a mile apart, with Daddy living in their old house, so going to visit him is very familiar.

Once he gets new beds for them and we start having them spend some nights with him (sniff sniff), what do you think is best for that age group?

FYI, I'm thinking:

With me Mon-Tue, Fri-Sat (yes, I know this doesn't give me a weekend, but we live with my mom, who can watch them if I want to go out)

With him Wed-Thur, Sun.

I know this deviates from the typical EOW, but I hate the idea of them spending an ENTIRE weekend away at this young age.

Or is that just fine for this age group?

Thoughts are SO appreciated.