Board Thread:Naruto Discussions/@comment-27521865-20190624190722/@comment-32685487-20190701154915

Only Itachi's Crow had 10 year recharge periods for the eyes Koto usage with Itachi saying it could be shortened with Hashirama's DNA involved. We have no idea how long of a recharge Shisui himself needed but if we use Danzo as comparison then its anywhere from a few hours to a whole day per eye.