And send it by post for approval, which will take 5-30 business days.

Fax, actually! Will still take 5–30 business days for approval, for some reasons

Oh come on, that’s not true. You could also fax it. That might come with an additional processing fee though.

I many days would an email take?

To a .de domain?

Of course

Dont be ridiculous, thats what FAX is for.