It’s very rare we hear of an actual 6 hour round. You can expect to be around 5 hours given the tournament atmosphere. Between late player arrivals, starting announcements, getting out to your start hole, coming back in and actually verifying your scores it may feel more like 6. From actual tee off to last ball drop we’ve gathered we’re around 5hr 15min which isn’t uncommon.
Generally speaking playing ready golf, finishing out your putts and keeping up with the group in front of you does just as much good as a ranger riding around the golf course.