6 hours though? I still say it's impossible.
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Yeah, I don't see how it'd be done, though on a planned and mapped out speedrun, it's probably possible. I think the kicker is that without doing sidequests and getting the XP involved, you'd be weaker, making it impossible to just blaze through the enemies in mob-heavy areas and necessitating a slow approach marked by lots of sitting and waiting to regen force points, whereas if you do the sidequests and gain the XP necessary to level up to the levels at which you become powerful and consequently blaze through the enemies with Form Storm and what have you, you've wasted a lot of time on the sidequests. It seems like a catch-22.
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Not to mention you would have to have all the "dice rolls" in your favor throughout the entire game as well. Each time you "miss", it's an extra couple of seconds tacked on to your total time defeating each enemy.
I just can't see, barring using God-mode or warping to specific areas, how it can be accomplished in 6 hours.