A typical day on most rotations begins at 7:30am and ends at 4:30pm, with some exceptions as detailed below:

GI – 7:00 a.m. to variable (usually 5:00 p.m.)
ER – 9:00 a.m. to 7:00 p.m.

Conferences are at 12:00 or 12:30 around lunch, and last for about an hour.  When additional conferences are scheduled (physics, outside lecturers), a monthly schedule is sent out well in advance and posted online.

M, W, Th, F: 12:30 p.m.-1:30 p.m.
Tu:  12:00 p.m. – 1:30 p.m.