Our WC doesn't take appointments (walk-ins only), so we don't have any set time-limit. Sessions uslaluy last 20 - 40 minutes, rarely over an hour. Longer sessions are exhausting, for the tutor as well as the writer, and a major concern for me is that if we address higher order concerns first, then move on to lower order stuff, the student leaves only remembering the last points of discussion, and forgets the really important stuff.However, I've had some marathon sessions - uslaluy late semester, students coming in with 15-20 page papers from our writing intensive Nursing course. Freaked out and last minute, we covered just about everything. I told the student beforehand the kinds of things we could work on, and at the end of th session, spent a few minutes reviewing ALL the points we had gone over.
