Hmm, let's see....
1e: about 20 years worth, maybe more?
PF: 9 years
5e/2e: 5 years worth each. I like 5e. I can see it catching up to my PF tally.
BC/CMi: roughly about 4 years worth
3.5: 3 years
4e: 2 years
3.0: 8hrs
OD&D: never
*I estimate this time as about 1 4hr
+/-session per week. Roughly about 45 sessions/year. It's not an exact science.
OD&D:
Never.
I didn't even know it existed until I began reading Dragon along about '82/83. Though I have the reprint box from a few years ago, I doubt I'll ever actually play it.
BE
CMi:
Christmas 1980 - roughly mid '83.
We were kids, so we had a lot of time. So we played a lot of B&E in contrast to the actual years. Progressively less of the CMI portion as our games faded more & more into 1e.
Now & then over the years as one shots etc
1e:
'82-'89 - 7 years by the calendar, but hour wise probably closer to 14.... At least. We played
ALOT of 1e.
'89-'94 - Sporadically because of 2e etc, a few short side games, stuff mixed into 2e, & every year at GenCon.
'94-2012 - pretty much only at GenCon. So about 1 years worth split into 3 day segments spread over 18 years.

2012-july 2016 - Yay! A weekly+ 1e game! Nearly 4 happy years.

2016-present - "sigh", I'm back to the GenCon only diet. About 12hrs of play.
But since finding 1e there's never been a year where I haven't played this edition.
2e:
'89-94 - weekly game
After that only sporadically at cons. Mostly due to a combo of MTG, Vampire, adult life/job/etc & finally being able to afford my miniature war-gaming interests.
3.0:
'99? Y2k? (the year 3.0 launched.)- I played about 8 hrs worth at GenCon that year & owned the 3 core books. It was ok. But work etc. & mini-gaming.... Lots of miniature war-gaming. Late '90s - 2006 I spent a lot of time/$ waging war across all genres in 15mm-30mm scale.
3.5:
After an extended tour of duty in miniatures war-gaming I returned to RPGs in early/mid-2006 when some friends from the college days wanted to get a game running again.
Overall I ended up playing 3x (we mixed 3.0 & 3.5 books) weekly 2006-2009.
4e:
2008 - as DM
2009 - as player
That was enough of that.
There's some games you find where you can play as either DM/player. Others just as a player. 4e was neither for me.
Pathfinder:
2009 - present. Weekly game. Time spent evenly split between being player/DM
5e:
2015-present.
2015 - 1 game/week
2016 - present - 2 games/week
Overall I've spent this time pretty evenly split between DMing & player.
I like 5e & can see it catching up to my PF totals. It'll probably fall short of my 1e xp when 6e eventually comes along.