Different drinks last longer depending on the proof and the dosage. Basically, the more intoxicant in your system, the longer it takes to get rid of it. It my vary from person to person, but if you have two drinks, each 50 proof, one won't make you drunk longer than the other for the same quantity.
Now, MIXED drinks... that takes longer, because your body processes each type of drink seperately.
Anyone want to try updating the 2e Netbook Guide to Alchohol up to 3(.5)e? I've found great use for the 2e guide... esspecially the section on specialty drinks, and I've hinted to my players that alchohol dragons exist somewhere in the world should they ever want to go trying to hunt one out. The hangover rule has been fun to use as well.