That being said coffee brewed in the fridge at a very low temp will need those 8 hours to release all the caffeine.
Cold brew coffee room temperature or refrigerator.
Cold brew is one of the hardest things to mess up if you ask me so i would just brew it room temperature.
An essential rule of thumb to remember if you will brew your cold coffee at room temperature then a steep time of 8 12 hours is enough.
But in short cold brew coffee can go bad and if you store it at room temperature it will go bad pretty fast.
I have a filtron cold brewer and i let it brew for 16 18 hours at room temperature with an extremely coarse grind.
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Room temp sounds like a good way to grow bacteria.
Fridge brewing will take considerably longer to extract but there shouldn t be any difference in flavor.
Please do not store your finished cold brew on the shelf.
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Even so you ll need more than just 8 hours to cold brew a good cup of coffee.
Can you store cold brew at room temperature.
If you extend a brew process in time than you generally have a larger interval of time where the coffee will still taste great but since it s already hours long i really wouldn t worry about it.
Consider storing your coffee like your store other perishable food for as short a time as possible in your refrigerator.
If you store it in a refrigerator your coffee will probably hold for 1 2 weeks at least.