As you get more familiar with your BP and his habits, you will know as soon as he enters a shed cycle. You will notice a slight dulling of his colors, and the belly will turn pink. Typically, my BP's start soaking at this time, also. A few days later, the eyes will cloud over. After the eyes clear up, it will be a couple more days before he actually sheds. I have noticed that the skin on their neck (do snakes have necks?) gets very loose after the eyes cloud, too. These are all very reliable indicators that your critter is in shed. I have had BP's take anywhere from 4 days to 2 weeks to complete a cycle, but normally it's about 5-8 days.