It lasts for one hour, and you can only transform into other humans.
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when jk Rowling wrote the books, there was never a mention of an animagus polyjuice potion. however, in the second book, it does state that when you use the pollyjuice potion, you cannot try to turn yourself into an animal, or else something will go totally wrong. Hermione learned this the hard way when she accidentaly put cat hair in the potion instead of the girl's. she got stuck in a half cat, half human state and it took forever for her to recover.
Harry Potter threw a firework into Goyle's potion during Potions class because him, Ron and Hermione needed a diversion so that Hermione could sneak into Snape's private stores unnoticed and steal some ingrediants. They did this to make the Polyjuice Potion.
Book/Movie 2. Polyjoice Potion also plays an important role in book/movie 4 and 7.
When you are polyjuiced to someone else, your vocal chords are transformed as well... (let's not bring up the films -- they have nothing to do with the books)
In Harry Potter and the Chamber of Secrets, Harry, Ron, and Hermione use the Polyjuice potion in order to appear as Vincent Crabbe and Gregory Goyle so that they could infiltrate the Slytherin common room and talk to Draco Malfoy. Hermione has accidentally used the hair of a cat instead of Milicent Bulstrode.