By the way, I just read your initial questions about secondary v. primary and how long to keep it on the primary.
I am not going to tell you to do it one way or another...that can be a hot topic here.
I will just tell you a piece of advice that I've heard and used with success.
If you are using a clear fermentation vessel (glass, plastic), keep track of the number of days it takes for the krausen to fall. Once the krausen falls, leave it alone for the same period of time. For example, if it takes 7 days for the krausen to fall, wait another 7 days before you think of touching it. It may be ready before that, but waiting won't hurt and might help. Then, after 14 days in this case, take a hydrometer sample. If you hit your FG, you are ready to package (transfer to bottles or keg).
This is merely what I do and I have yet to be surprised by the hydrometer reading. Your mileage may vary.
Eric
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