Robin / Mercer Island/WA
Normally I practice 10-15 minutes before a round, and occasionally 1/2 hr or so after a range session.
3 Putts? Any is too many, honestly, about 4 per round, almost never 4 putt unless hole placement is weird.
Most interested in working on 4-5 footers, I have great distance control , but blow too many 3-5 footers. Analyzing consistently what I do with the putter face, and applying it would be a big "strokes gained " benefit. Exputt seems to be the best way to do this at home.