I'm at about 197 hours, and done with pretty much everything- this game was so insanely fun I just took my time and tried (and am still trying!) to make it last as long as possible! I didn't use a guide and only looked stuff up online about 5 times or so when I really got stuck on something, so that naturally means lots more hours dicking around and doing stuff the slow way.
Also, FFXII's story may be a bit simple and straightforward, and boring and unclear at times (though I was ultimately won over in the end), but the game is still an amazing game because, unlike some other FF's with more interesting stories, FFXII is actually fun to play! A novel idea, I know, but video games, being games after all, should first and foremost be fun to play. If I want a great story I will watch a great movie or read a good book; FFXII is awesome because the gameplay is really fun.