Harry Potter and the Chamber of Secrets2002

[In the library, Hermione takes a book about Polyjuice Potion from a shelf and goes over to Harry and Ron, who are trying to find which books they should take from a shelf.]

Hermione:
Here it is. The Polyjuice Potion. [Reads from the book] "Properly brewed, the Polyjuice Potion allows the drinker to transform himself temporarily into the physical form of another."

Ron:
You mean, if Harry and I drink that stuff, we'll turn into Crabbe and Goyle?

Hermione:
Yes.

Ron:
Wicked! Malfoy will tell us anything.

Hermione:
Exactly. But it's tricky. I've never seen a more complicated potion.

Harry:
Well, how long will it take to make?

Hermione:
A month.

Harry:
A month? But Hermione, if Malfoy is the heir of Slytherin, he could attack half the Muggle-borns in the school by then.

Hermione:
I know. But it's the only plan we've got.