I honestly have no idea. I never really kept track of any of it. The only thing I do know my actual play time would be the Halo games starting with Halo 3. According to my service record at Waypoint, here's how much time I put into the games:
Halo 3: 1149 hours
Reach: 1327 hours
Halo 4: 342 hours
MCC: 386 hours (175 hr in Campaign)
Halo 5: 61 hours so far (haven't played in over a week; the game really isn't doing anything for me)
Assuming an average of 8 minutes per match, I probably spent about 800 hours in Halo 2's multiplayer, and probably several hundred hours playing campaign. As for the original game, I've probably amassed at least 1000 hours combined between Campaign and LANs (mostly Campaign; I can play HCE constantly). I've also probably spent upwards of 200 hours playing ODST. Overall, I've amassed well over 5000 hours playing Halo games these past 14 years, well over half of which was spent in multiplayer.
And as for non-Halo games, I can't even begin to tell you how many hours I sunk into games like the Super Mario series or the Mega Man series. For the Super Mario series alone, I've probably spent several thousand hours combined, and quite a few hundred hours playing Mega Man games. I've beaten FFIV probably a dozen times, meaning I've sunk several hundred hours into that one game alone.