Hi,
I am able to get into recovery mode and complete the full cycle where there's an apple logo in the middle and recovery is in progress. IT takes about an hour for it to complete, however, the watch restarts and comes back into recovery mode post that.
It's a 2 year old watch with no issues...
I was upgrading my iPhone 6S to iOS 10.0.2 when my phone went into recovery mode and now it shows the iTunes logo. When I connect my phone to iTunes, it says "There is a problem with the iPhone that requires it to be updated or restored" so I go along with restore because right now I don't care...