Depending on how fast you consumed, if you ate, and on your body size, some will have alcohol leave the system faster. To be on the safe side, I would wait at least 10 to 12 hours to digest and expell. Did you know that there are more drunk drivers on the road on a monday morning, because of heavy drinking on the weekend, they don't realize they are still over the legal limit when heading to work after a weekend of binging. That is why you have to be extra careful, defensive driving on early monday