Final Fantasy games only as those I know the times for. I consider 'min' as time from start to defating end boss, not really going round getting stuff, and 100% until I do enough stuff where I think I can't be bothered to spend 16 hours playing once minigame to get one weapon. But below are minimums. I'll check and EDIT this later with my 100%
Final Fantasy VII - Min: 25-30hours - 100% (or what I bother to do) 44hrs apparently
Final Fantasy VIII - Min: 30 hours to Ultimecia, 100% (or what I bother to do) 50hrs
Final Fantasy IX - min: 30-35hrs, 100% 50 hrs
Final Fantasy X - min: can't find save files...that's not a good thing, I had a nigh on perfect save file somewhere.
Final Fantasy X-2 - ....as above.
Final Fantasy XII - Min 40hrs, 100% (I consider this as close to 100% as I can as some of those IDIOTIC weapons I am never going to bother to get), 90hrs (defeating all extra mini bosses and hunts).
...Okay so this post is only half there...sorry, don't know why I bothered.
EDIT: I checked my file saves
Hmm, pie.