My office hours, and generally those of the faculty in the math department, are drop-in. That means that you can show up and expect me to be there during my posted office hours (plus or minus five minutes if I’m running a little bit late). You don’t need to schedule an appointment to see me; I usually operate on a first-come, first-served basis. I try to keep the waiting short by limiting an office hours visit to 5-10 minutes if there’s a long line, which means you might not get all of your questions answered at once.