no, a speedrun does NOT count. its not how long a speedrunner plays a game but how long the general gameplay is. for example, i can beat super mario bros in under twenty minutes. now if there WOULD be cutscenes for like 30 minutes, it woudl still be a game because there is content in that game that can ake you up to ten hours to do all of it. and thats the point.
heavy rain does not get longer and deeper if you take your time playing it. maybe by a few minutes but not by a long shot. neither does metal gear. resident evil however, you can play one area for hours, finding little secrets and secret locations...