Aw, cute little hiding place! It does take several days - in my experience, sometimes even up to a week (or more!) before the spider has emerged a molted animal. They sort of just hang out in the retreat, won't eat or explore. It's normal! I just give a light misting of water around the area so that if it does crawl out, it has the opportunity to drink.
Molting is such a risky process - I always cross my fingers that all goes well for the little buggers!