Some snakes are very hard to see the signs the lighter ones especially can be very difficult my BEL is really hard to tell I miss the beginning all the time. I have never seen a snake take less that 10 day I suspect that the initial signs have been missed the hazy dull look is first, then a milky appearance, followed by a pink belly, then blue eyes, and clearing of the milky look and the actually shed.

I sometime hear some say sheds are only a few days but that is from blue eyes not the beginning of the cycle.