Board Thread:Naruto Discussions/@comment-38812954-20190924074243/@comment-32685487-20190926165839

Danzo used Koto against Mifune, and then at the end of the fight vs Sasuke the eye was ready again and he was going to use it on Obito as soon as he killed Sasuke, but he ended up crushing the eye so Obito can't take it instead. So Danzo can use it twice a day.