She’s A Mad Scientist And A Liberal Democrat

…and a humanoid cat

The Doclopedia #3,092

Facts About Potions: Polymorph Potions

It is almost never mentioned among potion makers, but in about 3% of cases, the shape change can last from a couple of days to a couple of weeks. There is generally nothing one can do about it except try to use the new form to advantage, if possible.