Visits ending too late

I know this can be such a pain, my kiddos are the same way 4 & 7, in bed between about 7:30 - 8, but on visit times it can be a bit later because they aren't even home until about 7ish. Somethings we've started doing that have helped, sending a packed dinner with them, and having a little pb&j ready when they walk in the door if they didn't get enough. Everything is laid out for bed, with our nephew (4) it's literally a 3-5 minute scrub down shower, maybe 5-10 minutes of play, reading and bed. We've got it down to about a 20 minute process. It stinks and the kids get upset we can't hang out and play but it's what it's got to be for now. I'm dreading beginning overnights and such I KNOW the schedule will not be anything near the same...Grrrrr.....Good luck I know is't frustrating...