To as, do you have a set time?

[Sleep10]

I'm just wondering if you have a set time to pick up/drop DC at other parents.
Blended family DSC are adored in every way.
Absolutely love love love it being our time and more.
We don't really have a 'set up routine' though we usually have the same days and while I don't mind as such sometimes when the other parent says one thing but than leaves us waiting around (has to be on there terms always) so DSC don't know whether they are coming or going, which is why it got me wondering.
I don't want to bu and suggest it, and it has any negative impact on DSC, but on the other hand, if it could benefit them, maybe inbu.

My partner does all the pickups and drop offs. We don’t have a set routine, as such but coordinate with the other parent if she needs the kiddo back at a specific time on Sunday. Otherwise we drive her back when it fits with our plans for the day and whether the kiddo wants to go home early or stay with us for dinner. The mum never once in 13 years dropped her off to ours herself. Nor offered to pick her up.

Yes there's a "default" schedule. A "eldest is working" schedule. A "school holiday" schedule and then they just adapt these as needed.

We have 50/50 in the holidays and 4/7 min term time.
Sometimes, other parent wants us to pick up in the morning if DSC hasn't attended school where as it was always collect after school or 6pm if both of us were working on Friday.
Drop off now they state on their times depending what they are doing anytime from 11am - 10pm.
DSC youngest never wants to go home, has other siblings at home that are with parent and step parent.
Older DSC now stay more at ours as are older teens, younger child still in primary. Parent won't let younger DSC live with us but started randomly ringing at odd hours saying had enough, come pick DSC up.
I think younger DSC would benefit from set time to pick up & drop off
We then don't have DSC getting upset when we are in the middle of something and have to abruptly stop to do drop off and also isn't left wondering when we're picking up for our time.