Don't send everyone to the range at the same time. We hold our class size down to 32 because we have 8 shooting lanes on the range. 16 people go to the range. 16 people eat lunch while watching "The NRA's Guide to Personal Protection Inside the Home" (DPS approved video in 2005, 60 minutes long.)
It takes about an hour for 2 rounds of 8 shooters, so that works out great. So, what do the other 8 students do at the range when they aren't shooting? They are watching, observing, helping keep the 8 shooters pointed in the right direction and out of trouble. In other words, practicing gun safety. I think that qualifies as instruction.
They get done shooting and headed back to class about the same time the video is done and those students are headed to the range. Now, understand, you cannot manage this scenario all by yourself. It requires one instructor in the classroom, and one on the range at all times. And an extra RSO to help manage the range. Luckily, there are 2 of us, so we only have to come up with one other to help RSO.
Now, knowing you aren't good at math, you need to get your wife to figure out for you how many students you can have in a class to make this work for you.
