Never had a time limit on how fast we had to reload a shotgun that I remember. Today when I teach shotgun to our cops, I tend to bastardize the lesson plan and course of fire during the practice stage. I know the lesson plan says we are to have the students flip the shotgun upside down and load the magazine like they do at the loading barrels and to CMA, I do mention that. However, I tend to bring a bit of Marine training to the USAF and go hard and heavy on keeping the butt in their shoulder, eyes on the target and load with the weak hand while keeping their firing hand on the pistol grip. I emphasize to them that I'm never worried about speed but am far more concerned about technique. Speed up and wind up stuffing a shell in backwards is going to take you a lot longer to get that gun back up and running than if you would have taken your time to ensure you did it right the first time. Just ask yourself, if you are in a hurry, do you have time to do it right a second time? Don't get me wrong, speed isn't a bad thing but technique, smoothness and doing things right the first time is always going to win out over raw speed.