Medicine - usually 2, sometimes 3.
General surgery - whoever you saw in a case, and if they stuck around for a while, could end up being 0 or 5.
Trauma surgery - we pre-rounded as a team (without the attending), so however many you could see before they'd all been seen - usually only 2.
Peds - 2-3, max. I was on a floor with unbelievably sick children, so their plans were incredibly complicated. Things happened overnight on a regular basis, sometimes very significant things. Unlike Doctor Bagel, my peds patients stuck around forever - most of them on the floor at any given time were there for months.
OB/GYN - 4-5, because they're almost all healthy otherwise, so there's not much to say. Plus, you have to see whoever you had delivered, and if you're post-call, there's often a lot of them.