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Do I let the it go a full 21 days before a diacetyl rest, or do a do a diacetyl rest after 7 days? How many days should the rest be? If the later, do I finish up the 21 days primary schedule after the rest? Do the D-rest days go towards the 21 day total?
confused...
The D-rest should be performed as fermentation slows. For this lager it's probably best at around day 5 to 7. If there is diacetyl you'd like to have somewhat active yeast finish that off.
Leave the beer at a warmer temperature for a week. From there you can bring it back to lagering temperatures for another week or two. Rack to secondary and lager as long as you'd like. 6 weeks seems to work.
I hope that's not too confusing:
Pitch, ferment for a week at 49 to 51 degrees
Warm beer to 59 degrees for one week
Chill to 51 for a week or longer
Rack and lager at 40 or less for as long as you want