Oof. Let's see....I'm in 3 different gaming groups. For one of them, I'm a DM and for the other two, I'm a player. We use Google Docs to post our write-ups, recaps, and XP...so I have exact numbers for most of our gaming sessions (but not our one-shot games).
My wife's current campaign has had 22 gaming sessions, and the one prior to that we managed 13. She also did a handful of one-off games and test runs before kicking off the whole thing properly, so I'm gonna say 38-40 for that group.
The second group has been playing regularly in two different campaigns for about 4 years now. We had 44 gaming sessions in the previous campaign, and we are 26 gaming sessions into "Storm King's Thunder" right now. We've had a handful of one-offs as well, on nights where our DM was out of town and someone stepped up with a quick side adventure. So I'd say 70-75 games for that group.
The third and newest group, in which I'm the DM, has had 4 test games and one-shots, followed by the official kickoff and 12 gaming sessions, for a total of 16.
All told, it looks like I've played 124-131 games under the 5th Edition rules. Not too shabby!