Hi and welcome to JA.
Alcohol passes quickly from your mouth into your stomach and small intestine, where it is absorbed into the bloodstream. It's then circulated through your liver and on to your heart, lungs and brain. The faster you absorb the alcohol, the higher your blood alcohol level will be, and the more alcohol in your blood, the greater its effect will be. Absorption is more rapid if you:
* drink quickly
* add a fizzy mixer
* drink on an empty stomach
* are small, young or female
Your body is cleansed of all alcohol by your liver as the blood flows through. This is a slow process. Alcohol is eliminated from the body at about one unit (10ml) of alcohol per hour. So, the alcohol in one pint of ordinary strength lager will take two hours to pass out of your body. If you drink a lot in the evening you may still be over the limit in the morning. And, drinks at lunchtime could have a top-up effect, and again, could make you over the limit.
Please also see:
http://www.ads-helponline.co.uk/alc_you.asp
Hope this helps, if so, please accept. Thank you.
Cheers!