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.
Food. Always eat before drinking, especially foods high in protein. Having food in your stomach will help slow down the processing of alcohol. A person who has not eaten will hit a peak BAC typically between 1/2 hour to two hours of drinking. A person who has eaten a peak BAC typically depending on the amount of alcohol will occur between 1 and 6 hours.