I really don't know... I finished PREY in 8 hours, but other than that i havent given completion time a thought. But i finished HL2:Ep1&2 in at most 6 hours each.
When I was 7 years I got LoZ:OoT for Christmas and it took me and my dad a full year to finish.
When I was 7 years I got LoZ:OoT for Christmas and it took me and my dad a full year to finish.