Board Thread:Versus Debates/@comment-27233105-20160130092635/@comment-9782468-20160203050727

And Itachi sped Kakashi's brain speed up a heck of a lot to get him to perceive 72 hours in a second.

If Kakashi's brain continued to run normal speed he wouldn't have been able to experience 72 hours in a second at all.

Like I said, the math is sound. If Tsukuyomi distorts the victim's perception of time, it means the victim really experiences that distortion. Kakashi experienced 72 hours. That's 72 hours to get out of the Genjutsu. If he got out, less than a second would have gone by