I like a 3.5 hour round or less, a 4-4:15 hour round is OK, 4.5 hour round is fairly slow (15 minutes a hole) and if it's over 5 hours (17 minutes a hole) you should find another hobby, learn to play faster or play when you aren't holding anyone up. That's why I'm a member at a Private Course. On our course if you can't play in 4:15 (just under 14 minutes a hole), you're not allowed to play on the weekend before 10:30 am.
I think most people don't realize that they are slow or even know what slow play is, and I think the majority of people, who don't play often, have never had anyone teach them etiquette on the course. Fix your ball marks, replace divots, pace of play, rules of the game, how to tend the flag, where to lay the flag, don't stand or step in someone line, etc. All contribute to slow play. I wish all new golfers would take an etiquette class before they play.
Tournament rounds, on the other hand, are definitely slower than a regular round as everyone has to play out every shot, take your time looking for lost balls, etc. So I'm prepared for a slow round during a tournament.
Question: For those that think a round under 4 hours is fast, what do you do for 15 minutes on average per hole if you're shooting for a 4.5 hour round? Or even just over 13 minutes per hole for a 4 hour round (13.33)?
On average I walk 100 yards in a minute, take seconds per swing, and at most a minute maybe 2 on the green. So for a 400 yard hole walking, it takes me under 10 minutes a hole average to play a hole. So that's 3 hours walking normally. Now I don't spend time searching for balls, as I hit the majority of mine in the fairway (plus I take no practice swings) and I hit a lot of greens or just miss the green.
And I would also say that on the weekends I know several guys that try to get in 18 holes before their kids/wives days get going and want a chance to play on the weekend. That's what I did when I had kids at home. And taking 4.5-5 hours to play, when you know you can do it in 4 hours is hard for most to take.