V.B.
2-3 weeks. If I have a conflict due to a kids' activity, it wouldn't matter if it were 2 months out If kid has a concert or school event or practice for something, etc, that mostly requires that I be available, but if you make it 2-3 weeks that lets me NOT schedule that sleep over or after movie pickup for the kids that might get planned just a few days in advance. My kids are older. So I don't need a sitter anymore. If I still needed a sitter, I would need a couple of weeks to get that lined up.
As it stands now, I just need to keep husband from planning something for a particular date most of the time. But sometimes a piano lesson or something has to be rescheduled due to other conflicts on the regular lesson day. That sort of thing. So, 2-3 weeks would be most appropriate for me.