is normal take more than four days to get one key?

it can take up to a week if not sucks

They will send the email to the email you entered under Account->E-mail Address. You can check if that one is correct, check your spam filters, and take a look at the description of the giveaway in case the creator mentioned something there.

Just wait until you try to give someone a game and it takes a week. That's even more annoying.

Yes.

faq pls.

"which email they use to deliver the keys?"

uh...their own email? ( ͡° ͜ʖ ͡°)