We did one college visiting trip with each kid, and only hit four or five schools each. The goal was for them to see different kinds of campuses and schools to learn what they might like. We didn’t visit every school either one applied for. The fact is that we live way off the beaten path (SE Alaska), and there was no way to visit more.
My D20 found her ED school on her tour and is happy there. My D22 was only able to do a self-guided tour at the school where she she wound up. It all worked out. We saw tours as a way to look at types of schools, rather than as a complete exploration.