After how long can a nickname be reused?

I accidentally entered the wrong email address and now I can’t use the nickname I want. After how long can a nickname be reused?

What has the email to do with the nickname??

A nickname must not be the same name as in name@domain. It’s an extra individual field during registration.

The nickname you did choose is the one you got. Changing the nickname is currently not possible.
When a account has a name, then it can’t be used on any other account.

Or is this description a translation mistake and is about changing email?

When you started a change on email and do not finish it, then it will take 24 hours till you can change it again.