Oh lord, I have a problem. As of this moment, I am one of only two people (out of 15 respondents) who has selected "more than 50." I don't run a game every single week, but I often run two or three.
My Friday night online game of War of the Burning Sky is pretty regular; I'd say we generally meet 2.5 times per month, so that's 36 sessions.
My in-person game with friends and my wife is realistically about monthly, so I'm up to 48 there.
I run an occasional game online with my wife, her brother, and his wife; I'd call that another dozen sessions this year easily - that's 60.
And then I run Living Forgotten Realms games at my local store and at conventions. That's a bare minimum of one per month at the store, and I ran three sessions at the last convention and I plan to Iron Man the next one, which is nine more...
Holy crap, that's 84 sessions this year! And I'm not exaggerating at all.
Wow, no wonder I feel overwhelmed with all of the D&D I'm running! I need a hobby. Maybe I should take up role playing games...