Yes Tim you nailed it. There may be an "in between" too? I'm in New England, and we still see 5 hours on courses that aren't EH or US Open venues, the "non Black" parts of Bethpage, Trumps course in the Bronx, etc. I have played Bethpage Black in 6 hours and will not do that again! I think its that people watch too much golf on TV and emulate the pros routines, from club selection, to the Jason Day eyes closed thing, etc....I see it a lot. Not being ready to hit when its their turn, not lining up the putt while the other guy is putting, and (in carts) all carts going to one ball at a time. The usual pace of play mistakes people make, 10 seconds here and there repeated 50 times by each of four guys is half an hour. Its so easy to fix. I'm at a private club and yes, if you get to 4 hours you are now slow and will hear it from others. 4 guys walking is 3:20 to 3:45 with caddies carrying doubles. The most interesting is when we get new members who are used to 5 hours, and have to re-educate them on 3:30!