Allow 72 hours with lots of water. EBT test is used for people under supervision and thresholds are very very sensitive and and they are testing blood glucose vs actual alcohol. This is different from Breathalyzer or Blood test. From personal experience with a DUI program 5 years back. Lots of people didn't understand the EBT and were violated creating more problems for themselves. Taking a long walk at night is good way to replace drinking time.