How long does it take to learn photography?

At least three months, theory and practice. Two years at most, that is, the kind of formal photography colleges, and when they come out, they also have relevant formal diplomas such as graduation certificates. The former is unlikely to be a photographer as soon as he comes out. You don't even have the most basic photography experience. Who will hire you as a photographer when you come out? You'd better start as an apprentice and a photography assistant honestly! The latter is more likely to come out, but it also requires you to have a certain working foundation, or you can produce satisfactory results. Anyway, it all started with a photo assistant.