I have had at the most 6 shed all at the same time. Adults mostly but 2 were sub 400gms. Odd I wonder if there is some pheromone thing going on? Pet theory, many snakes 'call' mates to mate with pheromones released during shed cycles (rainbow boas for example) I wonder if Royals are similar... pre ovulation sheds and all that. It could be related to them syncing up sheds maybe. Just a thought...