Some ale yeast will ferment very quickly, 72 hours for a primary ferment isnt unheard of, and espically at a warmer tempurature. It also depends on your gravity if you have a medium to low gravity wort then it will take even less time for the yeast to consume the sugars. I made a cider that finished primary fermentation in 3 days, I used safale-04 dry ale yeast, og 1.051, 3 days layter it was 1.002 so it shows to go ya. Good luck.
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