With each successive entry in the series, my average time until losing ambition keeps lowering.
I have something like 700 hours in MH1, which isn't much, but there just wasn't as much content then. Only around 200 in MH2 because I couldn't play online. But then well over 1000 in MHF, MHF2, MHP2ndG, and then even MHFU even though it was the exact same game as MHP2ndG.
MHTri I only managed around 500 hours before I was satisfied with what I had and started just helping people. MHP3rdG, only around 250 hours.
MH4U, again, about 250 hours and now I don't really have any ambition of my own for new weapons/armor sets. I'm happy just playing with you guys. If I get a rare material here and there, cool, but I don't have any in-game goals of my own.