Aaronrules380
Member
Googling about I'm seeing stuff saying that the demo was an hour to an hour and a half long, although that's preshow reports of how much time Nintendo were asking attendees to put aside for the demo. Here.
Taking the shortest of that estimate (1 hour), the turnover if every person played the demo fully comes to 140 people per hour. According to the E3 website the opening hours were 12-6 on Tues (6 hours), 10-6 on Wed (8 hours) and 10-5 on Thu (7 hours). That works out at 2,940 play sessions over the 3 days. With ~50k people attending the actual show, that's enough time for a little over 5% of attendees to play.
There were two demos for non media members that this line was for. They were 35 minutes total. The 90 minutes was for press who had actual appointments, not the people lining up