What’s the magic number of schools to apply to?

I see my thread has deviated slightly ? — all good info though that has helped me answer my own question… the magic number is the number kiddo can truly see themselves attending.
Now this of course is based on 1 visit, schools website, talking to current students (if one knows any). If doing all these things I think the number will automatically be capped… who can do this for 16 schools?

We visited 7 as visiting any more would have been a strain (expenses, out of towners, missing work & school, One parent family etc) and DD ‘believes’ she will fit into all 5 she applied to.

The level of HOW MUCH OF A FIT will come into play if there is more than one acceptance. And I guess revisit day will then come into play.