So canonically, Yakumo can magic people into different objects/forms/etc, for a set amount of time. I think the maximum time limit he's shown being able to give is an hour, to transform a human into the appearance of a monster. He also turns people into gloves, scarves, toys... basically anything.

So the question is, what limits should apply to this ability during this jaunt? The 1hr max limit and magic consumption is enough to deter him from constantly spamming the magic, but is there anything else I should take into account? Or is there something like his magic-casting will succeed, but not be what he wanted - eg trying to magic himself into a human form for 1hr will instead result in him becoming a tree.