Well, the obvious choice would be Fallout and Fallout: New Vegas. Both are post-apocalyptic games and can take up many hours of your time. If you are looking for Skyrim-like hours putting into a game, these will be good choices.
Dead Island is another one that you can put a lot of time in to. There is quite a bit to do in that game. Not quite Skyrim-like hours, but still plenty of time spent in it.
Fallout game of the year edition or fallout new Vegas ultimate edition. Both great games and all dlc worth it. Also I loved metro . Look into that maybe .its a post apocalyptic Russia and its pretty fun.
The Walking Dead.
Story-focused zombie game with branching dialog and story-changing decisions. Very good voice acting and writing.
I played it through times and cried at the ending scene each time (first media to ever make me cry, and I cried a LOT).
How about “lone survivor”, it a PC game, with puzzles, surviving, and zombies great game I think there different endings when you beat the game and it’s quite thrilling!
Source(s): Played it, beat it 🙂
Dead Island maybe?