03-21-2017, 08:31 AM
I don't think a time limit would defeat the purpose of the spell, if the time limit was long enough. Fifteen to twenty minutes as a space rat does a decent job of being properly inconvenient and gets a guy out of the wizard's way for a good length of time, for instance. Quite a lot of people can only spare enough time for one round a day or so, spending about half of it as an animal is punishment enough.