I’ve encountered a few… obsessive people like what OP describes. College costs too much to maximize your time in it, but between taking a bare minimum number of courses and staying below the retake limit there were some really strange people who managed to stick around longer than 4 years. One guy was a personal thorn in my side for my entire tenure as president of a hobby student org because he had some beef with a previous administration years prior of whom all were long graduated. Found out later he was like 9 years into his degree yet spent most of his time trying to be influential among hobby student orgs.

longer than 4 years is normal, expected even, but when you start going into >7 years it gets...weird.