It looks like the wait for Watch Dogs will be well worth it. According to Ubisoft Montreal creative director Jonathan Morin, it can take anywhere from 35 to 40 hours to complete the main story of the upcoming open-world action-adventure. Completing the entire game, he says, is close to 100 gameplay hours.
@vytla102 I would say the average player which does free roam a bit tend to reach the end within 35-40h. But doing everything is close 100h.
— Jonathan Morin (@Design_Cave) March 15, 2014
This, of course, will vary from player to player, but that's still quite a bit of play time. After a pretty lengthy delay, Watch Dogs will finally be released for PS3, PS4, Xbox 360, Xbox One, and PC on May 27. A Wii U version is also in development, but currently has no release date.