Haha- I've heard it called "husky handholding" and it's totally normal, although a habit you probably want to break him of.
All it means is that he wants to play more. Huskies are HIGH energy and usually we will wear out long before they do. From the schedule you describe, he's probably just having a tough time settling down and he's saying "Daaaaad, but I want to play more! Do we really have to stop?"
Now, that's just my guess based on what you describe, however, regardless of what it is, it's very normal. Koda will gnaw on my hand like that to get my attention. He'll also go to town and lick it, or nibble on my arm to "groom me."
To stop the behavior, I would tell him a firm "No!" and replace your hand with a toy, followed by lots of praise. He'll soon learn that human hand in mouth = no. Hope this helps!
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It's a husky thing... you wouldn't understand.