I’ve seen a few brewers here lately wanting to keep their beer in primary for months. Not sure where this advice is coming from. Generally speaking, yeast chew thru wort in days vs months. Granted, some are slow to get across the finish line but we’re talking weeks not months.
Trust your hydrometer not the airlock. A FG hydrometer is easier to read and more accurate for determining if it’s done.
Package when complete. No advantage to waiting an extended period of time once complete. It’ll clear in the keg or bottle. Leaving it in a fermenter after active fermentation is complete can allow more opportunity for potential O2 pickup.
Your kit instruction sheet has general guidelines: 1–2 weeks primary, 2–4 weeks secondary*, 1–2 weeks bottle conditioning.
Your kit should be ready to drink in 4-6 weeks.
*I would skip secondary but that’s your call.
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