'Well I wouldn't say never, it may be possible to make an Eternal Mangekyou Sharingan if you have two pairs of the same set of eyes,' Isobu interjected, 'But I do believe it will be a long time coming. The amount of life force you used for this would truly come in handy in a pinch if we were ever in over our heads. As it is, it will take us months to gain that amount of chakra again, and that is assuming we do not get into any battles that force me to exhaust my chakra to keep us alive in the mean time.'
Naruto: Systematic Shinobi
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