on and 12 hours off when on call, not 24, at least at one Canadian hospital. I remember when I first started working in Emergency (in the US) that residents for all the services worked 12 hours routinely, and when on call usually worked 36 hours straight, and then were off for 12 and went back to 12 on 12 off until their next day on call. When I got to Canada it was the same here.
Sacre Coeur Hospital in Montreal has adopted a 12 hour shift for the on-call residents and a nominal 8 hour shift for off-call residents. As anyone who has worked in a hospital knows, "regular" shifts for hospital residents are very long because doctors are still studying and following their assigned patients closely, so after they leave the floor, they go to the library or to their room or apartment and put in more time studying the books and preparing for the resident's inquisition each morning on rounds.
At least this guarantees that the resident who sees you in the Emergency department isn't yawning or has slowed mental reactions to emergency situations.
Great Britain caps resident's hospital hours at 49 hours a week though you can be sure their noses are in books for a lot of additional time.
Regrettably no link for this particular story, but here's a CBC story on sleep deprivation among hospital residents.
I'll post the story if a link is posted later.
One of the best French door fridges we've tested
A good-looking fridge with useful features like an auto-filling water pitcher and a temperature-adjustable "FlexZone" drawer. It was a near-flawless performer in our cooling tests.