I brewed a Scottish Ale last weekend that is in the primary bucket now. I usually rack into the secondary a week after it was brewed. This ale is still fermenting pretty good though. Should I wait another week after most of the activity has subsided? I used a healthy starter on this one, so it has been fermenting like a champ.
You almost never need to rack to secondary unless you add more fermentables and need to do a true secondary fermentation. Otherwise it’s fine to leave the beer in primary for 3-34 weeks and then package it.
I do it for clarity more than anything
If you are going to rack it, you should wait until the major part of fermentation is done.
If you leave it in primary 3-4 weeks the clarity should be the same. At least it is for me.