Board Thread:Versus Debates/@comment-30830650-20170116074632/@comment-9782468-20170120063725

I... I don't know where your calculation for him fighting for days came from. If Jiraiya converts all of his reserves in order to make Sage Chakra, the quantity of chakra would only go up like a third (if we go by the visible depiction of Nature Energy being mixed with Body and Mind Energy in equal parts). Sage Chakra is just very powerful, so it takes less of it to do more. Now, idk how fast his reserves regenerate without him moulding chakra, but I doubt he'd last for longer than 24 hours. by continually mixing whatever small amount that continues to regenerate.

Actually, wasn't it stated that you need a lot of chakra to handle Nature Energy? Even if Jiraiya just gets low on chakra and doesn't run out completely, there's no guarantee that Sage Mode would work