Red Dead Redemption. Game time added up was over 100+ days. I'm guessing 3000+ hours or more. Played LBP2 and GTA 5 but probably not nearly as much as I played RDR.
Uncharted 3 coop for over 4000 hours spread over 4 accounts. Destiny ( 400+ hours) . Red dead redemption ( 100 + hours) Sniper elite 4 ( over 100+ hours) and now Sea of thieves ( 25+ hours counting...)