"Probably not indefinitely," Strange admits. "I have a similar spell that I use for storing my pens and pencils and I need to refresh that one every week or so. Since the tree is much larger, I suspect it would last a few days at the most before the spell dissipates and we end up with a large tree in the lake."

Coincidentally, the spell's going to fall when everybody goes back to the carnival. But Strange doesn't know that.

He leans slightly on Tyki's tentacles as he moves to get a better look at Tyki poking the water. When it ripples, Strange smiles. There we go. A practically perfect spell.