Drink Every Hour Metabolism?

If your body burns a rough average of a drink an hour, why does drinking 12 drinks in 8 hours seem to make me a lot more drunk than drinking 6 drinks in an hour? I guess it’s possible I have a slow metabolism for alcohol, but I know I have a high metabolism for everything else, even food. I tried to Google but had no luck. My only idea is dehydration since i tend not to drink water after I start drinking alcohol?