Thank god I finally finished FC5, play time was 11 hours but honestly felt like 30 with how tedious it was. And holy fuck, having to listen to 4 emotionally tortured and uninteresting antagonists give boring as fuck monologues followed by terrible boss missions made me want to uninstall half way through. At least I won't feel the need to play another FC game again for at least a couple of years.
11 hours? Maybe if you quickly speed ran just the story missions. Most people finish it in around 18 hours, or 30 hours if doing side quests.