When we visited for our first child pre-Covid we scheduled 2/day and then planned 2 day trips. This was during the school year, which is ideal as you can see students in their environment, perhaps attend a game or play, etc. Each visit would include a tour and interview at a minimum so I’d plan at least 3 hours/school. We did throw in a few drive throughs of schools we knew probably weren’t great fits but we wanted him to see just in case.