Originally Posted by Circle

beefjerky, Persona 3 can take easily around 70 hours.

Persona 3 FES is NOT a sequel, but the original game with some add-ons and a bonus-chapter that contains a different ending, where the anime Persona Trinity Soul picks on after. If you have Persona 3, buying FES is like buying MGS 2 Substance after having the original MGS 2. So, IF you are a HUGE fan of Persona 3, then it might be worth it, but otherwise not.