Just that really. Split with exDP for over two years and have had the same core routine for most of that time (barring a 6 month period where be didn't have DD over night). Exdp has announced he doesn't think this routine suites DD (preschool age) anymore and wants to change. He currently has DD three nights a week. Our week goes night at mine, two nights with dad, three nights with me, night at dad's. He's concerned there's too much going to and fro, even though he's usually dropping or picking up from nursery so DD would be going regardless of whose house she stopped at.
I think the routine suits DD, she knows what to expect and it's not been an issue for two years. I suspect he has a motive for wanting to change and I'm reluctant to do so for that reason as I don't really want to set a precedent where everytime he throws his toys out the pram, we change days and upset DDs routine.
Interested to hear other people's routines, though I appreciate its will very much depend on the child.