I understand the rationale behind taking hydrometer readings up to the point of getting the beer in the primary. What I'm curious about is what utility it provides after that fact if you tend to leave the beer in the primary for 2-3+ weeks (like many people suggest). Most fermentation finishes up in the first week or so, correct? Is there a reason to take a hydrometer reading after 3 weeks, other than to simply know your final alcohol content? I know getting a constant reading for 3 days lets you know that fermentation is complete so you can bottle, but if the plan is to leave the beer in the primary well beyond that stage, what's the point of taking more readings?
Just wondering if it's a necessary step in many cases.
Just wondering if it's a necessary step in many cases.