I'd say I've beaten it around 8 or 9 times, but after beating it last time, I just never started again, since I pretty much over-killed what would be considered 100% completion.
Ranch with nothing but Golden Chocobo
Everyone had every Master Materia
Max levels and stats, all sidequests, hidden extras and everything done
99 of every item I could have 99 of,
If I couldn't get 99, then the highest possible (I refused to use the W-Item exploit for this file)
All Limits, weapons, of course.
Way too much devoted into it, and when I got my PS3, I couldn't transfer the data over so I've yet to actually play it again.