Board Thread:Theories and Speculation/@comment-36019309-20190114073523/@comment-32685487-20190202200326

Sharingan Genjutsu casting can be instant the moment eye contact is made, as shown in the anime and the manga and that isn't even talking about Tsukuyomi alone. Itachi made the most brief eye contact possible with Bee and BAM Bee was in a Genjutsu and it was so fast and so brief that Bee didn't even know he was in one until Gyuki pointed it out, meaning despite his sun glasses and despite knowing not to make eye contact Bee still got caught in Itachi's Sharingan Genjutsu. It is NOT FTG instant, but it is instant, and Tsukuyomi is no exception. As Naruto said, Bee has no chance against Tsukuyomi showing that being a Perfect Jinchuriki won't help in the slightest against it. Only a extremely skilled Sharingan and MS using UCHIHA has a CHANCE to break out of it.