I used to schedule
I get the same amount of time as the classroom teachers, and while they have 25 conferences to schedule, I have over 50. I used to send home notes requesting they set up a scheduled time and I worked around all their other conferences if I could. It was expected that I also meet with every parent. It was a nightmare, I'd have many no-shows, a few who would reply that no conference would happen, some who asked only for a telephone conference but then would be hard to reach by phone.
This year I asked if I could simply offer open house-type hours, just stop by before or after your other conferences, and principal agreed. She also suggested, though, that I try to sit in on the conferences with the classroom teacher for the ones I am really concerned about. That way parent gets double whammy about services offered that they may not be using, like after school tutoring.