According to the 2012 EDU Advertising & Marketing survey 5-6 seems to be the most common amount of leads per rep per day. The largest share of schools seem to believe that 6 leads per rep per day is the sweet spot. When I worked at a school we had a belief that plus or minus 15% of lead flow admissions reps would still recruit the same amount of students. Which meant that they worked harder to contact the student prospects when they were not getting new inquiries as often.