Easily over 300 kids in the auditorium-sized classroom. I think there was an audible mass chuckle on the first day when he gave the warning about the potential for missed classes to affect your final grade. An online class almost certainly would've been more effective, assuming the student was serious - and if the student wasn't serious the lecture hall wasn't going to make a difference anyway.
Online classes definitely have value, but it does raise an eyebrow when the starting quarterback does an entire semester online. I wonder what percentage of A&M students take even the majority of their credits online, let alone all of them.