I suppose some of the serious compound shooters do that, but not in my circle of friends. In our group, you're most likely trying to shoot as quick as possible, before the buddy behind you, starts tickling your neck with a branch while your shooting. Or, one of the other guys starts letting out some not so subtle gagging noises.

We're hunters, and do 3D strictly as practice for hunting. Hold for more then 5 seconds and someone is bound to start mess'in with you. It might start with someone clearing their throat, followed by a comment like, "where you going to find a deer that will let you aim that long before releasing? Must be you got a license for a cage hunt this year." In our group, it doesn't take a minute for all 4 or 5 of us to shoot. In additon, not one of us would hesitate to shoot traditional equipment and we'd have just as much fun, shooting either. Then again, we're not really target shooters, we're hunters and our practice is dedicated to shooting how we likely would, if we were hunting. The equipment we use is irrelevant, and our actions are not dictated by what we shoot.