It would be helpful to know what your background knowledge is of residencies - are you currently a medical student, and if so, what year are you?
To try to answer your questions:
Orientation week - As I did a med-psych residency, my orientation was a little different - I did medicine orientation at the start of my year, and I don't even remember that. I'll try to guess what it would be though:
You'd need to get your white coats, oriented to the hospital - ID's, benefits information, ACLS training (at least for medicine - probably not for psychiatry), and probably a description of different rotations and expectations. You'd probably get your schedule for the year, explaining what rotations you'll be doing when.
The psychiatry call schedule at Univ of Iowa was done by the chief resident (a 4th year resident who is doing chief resident responsibilities as part of their elective time) - we did it on a month to month basis. We'd get to select any particular days we wanted call and days we didn't want call, and then the chief would make a call schedule that tried to accomodate everyone's wishes. For medicine, the call schedule was actually done on a yearly basis by the chief residents. All of these processes are subject to change a lot, and are going to vary a lot from program to program. I know that when I left Iowa in 2001, they had a night float system in place - which means that those rotating through call only had to cover from 5pm-10pm and cover 24hrs on the weekends. The night float covered the hospital from 10pm-8am on Sun-Thurs - and that position rotated either every 2 weeks or once a month - I don't recall how it was ultimately done.
You should expect to get weekend calls at most programs.
I would think that your first year or two, you'd probably get 1 day off each week. I think it is an ACGME requirement now that you do not work more than 80 hours per week (average) and you get at least 4 days off per month - I haven't reviewed that information in a few years though so it could have changed. At Iowa, though, the psychiatry weekend coverage was usually pretty light and we'd be done around noon or shortly after.
From what I remember, we'd get 3 weeks of vacation each year - and usually there are going to be certain rotations where you can NOT take your vacation. Probably less so in psychiatry, but definitely in medicine, you'd be prevented from taking time off during rotations where your service was needed - like in the ICU or on cardiology.
As far as how demanding int medicine will be - that all depends on the program you go to, and what rotations they have you participate in.
Overall, for general psychiatry, I would say the first year will be the most demanding - the medicine rotations (especially call) will probably be more stressful than psychiatry call (although not necessarily as busy - depending on the program). Also, you'll probably have more psychiatry call your first two years compared to later years - at least that's how Iowa was set up.
All of these questions are going to be very different from one program to another, so I'm not sure how much my answers help - but at least you've now gotten an answer
