White's Tree Frog : Help?

[ediblelogic]

I've owned my White's Tree Frog, Leo for about two or three weeks now. So you can imagine how new I am to the ways of his species. About four days ago- Leo started showing signs of what looked like dry skin. Now, I didn't know that frogs shed at the time- so you can imagine how concerned I became! After placing leo in his terrarium and spritzing his home with some purified water- I went online to look for an answer to my distress. Turns out, Leo is probably shedding, or 'sloughing'. This relieved me- but it's been quite some time now, and no matter how many times I check on him- he doesn't seem to be putting any effor towards getting the old skin off of his body (I've watched several video's on youtube of other peoples' White's shedding.). My question is: how long does it take for a White's Tree Frog to Shed it's skin? The photo below shows his current condition. I'm afraid he's a little dirty- he likes to hide beneath the moss where I keep his heating pad(beneath the glass case). If anyone could help me I would be deeply appreciative.