Well, the quick answer is...it depends!
The conventional wisdom around these parts is the 1-2-3 rule...1 week in primary, 2 weeks in Secondary, 3 weeks in the Bottle. If you are are planning to put the beer in a secondary then you can extend the primary to 3 weeks/1 month with no ill effects.
It also depends on style. A wheat beer, for example, you would want to bottle sooner (as soon as fermentation is done) as they are best when fresh and an estery flavor profile is desirable in this style. You would want to let other styles of beer sit for awhile so the yeast have a chance to clean up those esters and other byproducts of fermentation.
It has nothing to do with All-grain vs. extract vs. PM....
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