Nem on 13 February 2015
If you mean longest main quest...hmm... i think Xenogears was 60 hours, Xenoblade around that or longer aswell. Persona 3 and 4 aswell.
If you mean just roaming around doing side quests... it really depends on what one likes. Pokemon, Skyrim, Fallout, Xenoblade... they all had plenty of side content to take you above 100 hours.
