It depends on the kind of pharmacy one does. Nuclear pharmacy seems to be the most time-dependent, but most seem to be regular 8 hour shifts, while some hospitals do 7 days-on then 7 days-off work schedules, but you work 12 hour shifts on your days on.
The main reason why I went to pharm instead of med was having a conversation with a physician who said, "If you can think of doing anything else besides medicine, don't go into medicine." All the physicians that I've known have always wanted to be physicians from the get-go, and I realized that I was more into pharmacy then med, especially after talking to pharmacists about their jobs.
I suggest talking to pharmacists and physicians. The best way is to try to volunteer at a hospital.