Some encounters may take longer than their allotted times, while others may take less than the time allowed. It is NOT necessary to use the allotted time for any particular encounter if you are coding based on the documentation of the three key components. In other words you are not penalized for being efficient.
If you are only going to have 1-2 drinks, you should be fine to breastfeed. If you are going to binge drink, then you should wait two hours per drink before breastfeeding. Once the alcohol is out of your blood it is out of your milk. And pumping & dumping does nothing to speed this process up.
Stop drinking: Of course the first thing you need to do is to stop drinking. This way your liver will break down the alcohol without you adding more to counteract this process. You will normally break down alcohol at a rate of one unit per hour, so if you drink ten units it will take you ten hours to sober up. If you don't want to stop drinking completely however this also means you can start to sober up whilst still drinking.