I have been observing the hive at different times of the day. It is noticeable that the bees are more active (as expected) at certain times of the day. In mid-afternoon, and when the air temperature is high it is then a large number of bees appear to be just 'hanging out'. At their most vigorous mode the hustle and bustle outside the hive must resemble some kind of rush hour traffic.
Before I had the bees I had always assumed they will come and go very much like planes do at an airport. What I had not expected is this 'hanging out' together. When they do this many bees would just be milling around outside the entrance seemingly just chilling out. Maybe there is something we don't know about honey bees.