Over night is considered minimum, two days is typical. Dont actually need a french press for cold brew. I used a gallon jar and a paper coffee filter in a funnel to keep the fines out of my cup. The first 3/4 gallon siphoned out cleanly and with my beer making experience, I could probably do 6 gallon with 5 being useable. Problem is the use of perhaps 1/2-3/4 pound of coffee beans and discarding same.
The only thing a french press does is keep the major coffee grinds out of your cup. The fines sit in the bottom of your cup.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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