I did a "Cheat" Run once, i didnt finshed it though.
Possible Time for it might be around 3-4 hours (Maybe Less) Depending on your Computer Speed and how it can handle HiSpeed+Streaming/Recording at once.
The only thing you need for it is a decent HP-Junction (Ultima or something) to survive the Griever-Attack during the Ultimecia fight, the rest is Spam 9999 Auto Attacks every fight.
Possible Time for it might be around 3-4 hours (Maybe Less) Depending on your Computer Speed and how it can handle HiSpeed+Streaming/Recording at once.
The only thing you need for it is a decent HP-Junction (Ultima or something) to survive the Griever-Attack during the Ultimecia fight, the rest is Spam 9999 Auto Attacks every fight.