Yeah, I was thinking something like “come home for lunch” and swap roles. Both work half the day, and both get half a day to do a few chores/errands each week and get some downtime to play/learn/explore/tinker. Then divide and conquer in the evening the same way; split parenting time and other-stuff time.

Edit: Also depends if we can freely recombine and split. Merge to eat (most of the time) and sleep (amidst always) to minimize costs, split to do stuff in between.