The fermentation is usually complete in 3 weeks for the standard Mr.Beer® recipe,
which contains an HME and yeast, then 2-3 weeks for natural carbonation to be produced. While your beer is ready to drink once carbonated, additional conditioning time of 2-4 weeks will allow the mature flavors to develop.
Additional carbonation and conditioning times may be required for some advanced styles or recipes. Some of the most complex recipes can take up to 6 months of conditioning before they are ready to enjoy. In general, most beers taste better if you allow extra time for carbonation and conditioning.