Actually you can speed run the whole game in 60 hours. However, to do all the sidequests and upgrade everything and basically own the game, it may well take over 100 hours. Plus you need to do a second playthrough to finish the field guide.
I've been doing the same... not really hunting each side thing, but savoring the game... I really love the music in the sidequest town... how it changes when you add more stuff to the town.
I almost wanna get out EWatLO... I think that's it. It could be just the fantastic beer I just had though... 6.8% Let me tell you. --- "You lost the woman of your dreams, but you still have Zoidberg. You ALL still have Zoidberg!!!" - FUTURAMA