When the are babies, it takes anywhere from a half hour to a few hours to completely shed. When they become juvenile, it could take the better part of a day. When they are adults and finished growing, they could take weeks to fully shed, as they shed in sections and no longer do a full body shed.
Just up your mistings to help the skin come off. The only time I interfere is when some shed is stuck on the tip of the tail, eyes or toes for more than a couple days. That is to avoid having it dry up and constrict the skin underneath which can cause tail loss, toe loss or shed in the eye can cause eye infections. But I don't have to interfere often as they are good at getting it off themselves.