How far back does a urine test show detect alcohol for?

There is no set time. It depends on your age, your sex, your height, your weight, your metabolism, the type of test, and many other factors.

Before you post all that info, you should know that we cannot determine your metabolic rate, no matter what you post.

I can say that if you drank heavily within the last 2 days, it's unlikely you'll pass. Even 3 days is iffy.