I double the recipe with no issues. I make 4 loaves at a time.
I should have been clearer:) Commercial pans are 16" long and you end up with a loaf the size of a loaf like you would buy from a store. Not every recipe works for using these pans, for example banana bread.
Edit cause I'm stupid, it was another awesome bread recipe I did yesterday thats easier but I think this one beats it on the taste and chewiness factor.