I've been to a couple of the LC games and enjoyed them because,
1. I got to see a lot of friends, new and old, in one place.
2. The AO's were kind of neat.
3. For the most part it's a group of like minded individuals.
However, was it MILSIM? Beside the Super Bowl level gear show, no.
It had a command structure and loose storylines but with a large crowd you're going to get the "I paid $$$ to be here and I don't want to do those orders, I'm doing my own thing."
It comes with the territory. Plus there was a lot of walking around with no orders, objectives or directive. Just walk around until you see bad guys: shoot at bad guys.
Now I would have had more fun with direct objectives, even if no shooting was actually involved, as long as it was part of a larger scale cooperative.
Now a 24 hour event would be fun, but it takes conditioning and most Airsoft players aren't up to that level and aren't interested in achieving it. My personal goal is to get to that kind of level.
I think a good model for a 24hr scenario possibly in AZ is to design a game where you can utilize both the dedicated endurance guys and the players that have other desires. E.g. Have a firebase that runs out or finished missions every few hours, if your up for it load up, if not hang back until the next. Not only would this let guys who want to run the whole 24 ironman it out it can even inspire other player to want to obtain that level to extend their experience. I totally respect the guys that can run those long games. It's also a balance of AO size vs. player count. 300 players in a square city block? Just an Airsoft death match.
100 in a couple square miles? Totally different game. Now you have land nav, comms and tactics.