Board Thread:Theories and Speculation/@comment-3568954-20170205025300/@comment-9782468-20170205080615

Koto isn't something that doesn't last, really. The effect of Koto is altering a part of someone's mind without them realizing. So even when the technique ends, its effect lasts outside of the jutsu. The lasting effects don't need Koto or Tsukuyomi to sustain it; the effects last by themselves.