It depends
Longest per story: New Vegas @ 262 hours, Skyrim @ 155 hours, DAO @ 130.
Longest builds: SimCity 4 regions - ~7000 hours and counting.
Longest per story: New Vegas @ 262 hours, Skyrim @ 155 hours, DAO @ 130.
Longest builds: SimCity 4 regions - ~7000 hours and counting.