Rocket League is by far on top at 779 hours, followed by The Witcher 3 at 224 (guess that shows just how much of a completionist I can be), Fallout 4 (197), Divinity: Original Sin (147), Skyrim (130), and 121 hours in Dragon Age: Inquisition. The original Half-Life and it's various remakes (HL: Source and Black Mesa) is probably up there though; I must have played the original ten times back in the day, played through HL: S when it launched, played Black Mesa when it soft-launched with no Xen, and just finished the final version (holy [bleep], that reimagning of Xen! Best level designs I've seen in quite a while!) last week. Also probably at around 100 hours in BotW right now. A lot of hours of CS back in the 1.6 (and earlier) days, a bit of CS:S too, and I think I've launched CS:GO a grand total of one time.
Btw, isn't it rather odd for a mod to call out people for "making things personal" when all they do is say that with 24 hours in a day, the OP's reported play times are impossible? (Or was there a thread cleanup despite the mod saying it was pointless?) I don't judge anyone's choice of pastimes or how they live their lives - none of my business, after all - but claiming play times significantly exceeding 24 hours a day for more than 8 years straight? Yeah, that's just not possible. Games like these require more attention than it's possible to share between two simultaneous games or whatever might be done to inflate numbers like that. I don't care why the OP said so or how they might have arrived at those numbers, but they're nonetheless impossible.
