The answer to this is pretty variable as outlined above, and there can be dramatic differences between years.
Three programs I am familiar with through myself/friends at others
Program 1
23/28 12s 1st yr
22 2nd yr
21 3rd
Program 2
18 8s with two education shifts
20 8s 2nd yr
18 8s 3rd yr
Program 3
23/28 tens and twelves (overnights 12)
20 8s 2nd yr, 12s weekends
18 8s and 12s as above
Also, it’s important to recognize these schedules only matter when you’re in the ed. Most ed residencies have between 6-9 months of icu time. Icu schedules generally blow. Other off service months can be difficult as well, at least in terms of hours.
Another thing to consider is the content of hours. While I objectively worked more hours in the micu and the trauma icu, the pace of those hours was much slower. I generally find ed months more exhausting than icu months, even when I have less hours scheduled. There were also less circadian rhythm shifts as a general rule, though this was not always true.
Although I don’t know why you’re asking this question, I would be cautious about choosing ed based on the number of hours worked as an attending or resident. It’s a more challenging field than it first appears to be, and has a wider range of knowledge required than you realize at first glance. Rotate through the specialty, see if you can tolerate the type of work and the patient population.
Good luck