It's not practical at all. But it's not impossible.
It's just being relentlessly resourceful as PG explained last week.
As an officer you're on duty a few days a week. This means you greet the visiting families. It also means you troubleshoot any weird things that happen in the waiting room.
Probably once a month you'd have a kid who hitchhiked across country to come visit and who would ask about where he could stay nearby. Or kids who would cut school to make it there for a visit.
Also, if a family's hiring outside help with the admissions process, then they've already blocked out time to go visit colleges.
I only visited Princeton after I was admitted. I applied blind. My father had almost had a chance to teach there while he was in the army and had always thought highly of the place. I applied to all the big Midwestern colleges and we thought, what the heck, let's apply to one of these fancy Ivies.
It's kind of a classic story of a dream deferred.