I don't set a limit, but I don't generally drink very much anyway. I don't drink every day, and usually during the week if I drink I will stick to low ABV beers. If I am pulling beers from the kegerator, I typically use a smaller glass like a 6-10oz glass, and maybe for something like a mild or other low gravity beer I will pull a 12oz or pint. And, I tend to only pull one or maybe two glasses anyway before I'm done.
I tend not to crack open the big bottles of high gravity beers unless I have a friend or two around to help me drink it, although if it's the weekend and I know I'm staying in, I might crack one and drink it over a few hours, or I might pull more than one or two glasses from the kegerator.
I tried drinking a Black Tuesday (18-20% barrel-aged "RIS" in a 750ml bottle) by myself over the holidays, and it was a mistake. I started pretty early and planned to just drink a bit at a time over the whole day. I stuck to the plan, but I was still completely wasted by the end of the day, and I was pretty sick of drinking Black Tuesday by the time I finished it.