So according to Madara, whenever a Sharingan eye uses the Isanagi, it casts an ultimate genjutsu on itself and whenever the caster is hurt / dies, it manipulates the genjutsu. The genjutsu is so powerful that it blurs the line between reality and fantasy and thus the weilder is healed / ressurected. But whenever the weilder is ressurected, the Sharingan eye dies.
Danzo wanted to increase the duration of his Isanagi and wanted to be able to possess more than one Sharingan eye so asked Orochimaru to implant the cells of the 1st hokage in his right arm to get the wood style and then implanted 10 sharingan eyes in his now powerful right arm. So he had "10 lives"
Am I right till now?
Then my question is, what was Karen, during the fight, was talking about one eye closing every 60 seconds? I thought an eye closed after the isanagi ressurected the weilder..then whst was thing about an eye closing every 60 seconds?