Sure Fallout 3 is long (it is sandbox), but IMO the longest game has to be Persona 3 (FES and Portable) and Persona 4 100%. On my Persona 3 Portable file, I have almost 130 hours.
This includes: ALL Social Links maxed (yes, it is possible to do it in one round and from a clean save), all Social stats maxed, all Personas fused (Orpheus Telos included), everyone's ultimate weapon, best armor and shoes for everyone, everyone level 99, all requests completed (even the Ultimate Opponent), almost all weapons, and all of Vision Quest completed (Vision Quest has souped up Arcana Shadow fights and 5 "challenges". After that, you fight can fight an optional boss), and fusing "the ultimate Persona". (like a Messiah with all Severe elemental skills or a Succubus with every status inflicting attack, despite not being useful. =P).
Persona 4 falls in the same category, except the ultimate weapons are available on a New Game+, but still can lead to a 100 hour playthrough.
Anyway Front Mission 3 must be one of the longest games ever. It has 2 paths, and each one supposedly takes 100+ hours.
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