This is pretty similar to meditation after all, just with a constant expense of active magical power. Not even that much, now that it's hot! All he has to do is keep the magic balanced and steady. And hey, he does have the magic reserves to back it up these days. Twenty minutes proves to be legitimately easy.

Plus, it feels pretty good being next to a warm oven that smells of cookies on a cold day. The scent's less of a distraction and more of an additional focus, being tied directly into the task at hand.