Board Thread:Versus Battles/@comment-27044517-20190126221006/@comment-28970456-20190211015204

DMUA wrote: Despite having this capacity eledgedly, they never used it, making it extremely unlikely to actually be a factor under any reasonable assumption.

it clearly says "Up to" which is about as vague as bankai and considering it's contradicted by feats, well It would obviously mean that, if Chara wanted the full effectiveness, 3 seconds of time are required. Any less wouldn't be as effective.

Also, yes he did use it. In the fight against Asriel Dreemurr.