I've been playing or running 5e pretty consistently since launch across multiple groups, stores, and states. One thing that seems pretty regular across all of those tables though, and that's the number of average combats per day. If I had to give an integer, I'd say that the average I've seen is only around 2 per day and the most I've probably ever seen is 4 fights in a day. In some campaigns, we regularly have one combat per day and that's it. The recommended number of encounters per day in the DMG seems completely bonkers, to me.