When I first joined this forum, I remember reading a post that was similar to yours. The poster questioned whether 12 beers a day was too much. I was reading the post out loud to my daughter and her response was:
"Is 12 pieces of cake too much? How about 12 glasses of soda? Twelve slices of pizza? Or even 12 glasses of water? Is that too much?"
When you look at it that way, the answer is easy. Twelve of anything is too much. Twelve beers is much more than casual drinking; it's evidence that a drinking problem probably exists.
Even if your husband doesn't think he has a drinking problem, the fact that you've joined this forum tells me that you have a problem with his drinking. When somebody else's drinking is causing you a problem, Alanon is the answer.
Welcome to the forum.