I've kinda been trying to keep track of this with my Ball pythons. In the summer when it's a bit easier for me to keep up humidity (I live in the high desert) My balls go blue, clear and in a few days they shed. In the winter when it gets so dry it is a constant struggle to keep up humidity they go blue, go clear and then it has been as many as 5 days prior to the shed. I think it just takes longer for it to loosen and be ready to pull off. Anyone else got any idea's?