There are recent work restrictions on residencies. Interns work 80 hours per week, upper level residents can work many more hours than that. There is also talk that they will increase the work hour limit, as many believe that post-graduate training is not sufficient. I would also like to point out that before these work hour restrictions residency would easily mean >120 hours a week, for up to 8 years, not counting fellowship. Just something to think about when comparing older doctors to younger ones. What I'm really trying to say is, if you do decide, as a profession, to start residencies, it will rapidly become mandatory. And everybody will have to do it to get a job. Which will basically double the amount of time you are required to be trained.