Here are some samples of hair/ ear fringe growth of Papillons.
How long will his coat be....?
The length of the Papillons hair is developed mostly depending on his genes, but also on his food, health, environment, grooming, and, sable/red colored Papis seem to get less ear fringe.Spay and neutered dogs grow also a better hair coat.
Climate has an impact on hair growth. You can not expect the same amount of hair coat in Florida, US, as you do , if you would live in Alaska.
Look at his pedigree to evaluate the length of hair coat his parents, grandparents have.