How Long After Drinking Should I Wait To Blow Into My Interlock?

For one beer or shot I wait 3 hours and I always pass, I bet if you look up how long alcohol stays in your system you might get a better idea, I'm almost positive I read 3 hours per drink, but I've had about 6 beers and waited 6 hours and I was ok, do it when you think your good :)

Buy a $6 breath alcohol DETECTOR on EBAY.. Not breathalyzer, all you need is the detector. They're somewhat accurate for ACTUAL BAC but will show you if interlock will detect ANY alcohol.  Don't drive til your below a .02

Dude I'm not sure but 12 hours sounds like a direct hit to me.