I think a half hour is reasonable. An hour and a half is a bit much. There wasn't much we could do to plan ahead. Headphones don't work when kids don't keep them on, and I don't have a bunch of money to dampen sound in a room that isn't ours.
I didn't say dampen sound or the like. I said conduct basic parenting and plan for kids to get a little extra sleep elsewhere ahead and after a time you know regular sleep will be disturbed, the ssame as you would any other event that might alter kids' sleep schedule.
Gotcha. We did that. It's pretty difficult to get a toddler back to sleep after having the shit scared out of them for that long.