Usually, alcohol would stay within your system for around 24 hours after you have had a few drinks and this would be the time period during which it would be detectable in your urine. However, there are a few special tests which can detect its presence in urine for up to 48 hours.ere is a list of alcohol drug tests and the answer to how long is alcohol detectable in urine with each test. Breathalyzer Test: 24 hours. Urine Test: 9-13 hours (if traditional method used). Urine Test: 72-96 hours (if done using EGT (Ethyl Gluconoride) metabolite).