Have an ear infection taking antibiotic drops but the ear has had drainage nonstop for four days how long will drainage last is this normal?

That depends: You don't say if you have a swimmer's ear (external otitis) or otitis media with a ruptured ear drum. An external otitis is treated with ear drops alone, and the drainage should have noticeably lessened by now. In otitis media with a ruptured ear drum the drops won't be enough unless the hole in the ear drum is large, or you have a tube in your ear.