from what ive gathered, medicine is very much an ongoing learning process. which seems pretty obvious i suppose, but in terms of training after the 5 yr degree, i think it varies A LOT depending on what you want to do. for example, becoming a GP takes 9 years? and a consultant takes 11 years apparently.
but certain specialities like aneasthesia (typo?!) take considerably less than something such as neurosurgery, for example. this takes aaaaages. lots of exams!
(dont quote me on all of this though, im not 100% sure!)