Minecraft - 3000 hours minimum
Skyrim - over 1000 hours
Metal Gear Solid V - 800 hours (1/2 online pve)
Darkest Dungeon - 400 hours
Apex Legends - 5000 hours (split between both inputs)
Souls series - 600 hours

I'll be playing less games going forward because I've accepted that it's not healthy to invest such a large portion of my waking hours into something that is little more than entertainment. Although I am fully susceptible to the addictive nature of games, I would describe my relationship with them as a dependency and not an addiction.