I have a Blichman Therminator, but since it's hot as balls where I live, I can only get the wort down to around 80F. I have a dedicated fermentation fridge that's controlled to 64F... that's the temp I want for another beer that has been fermenting since last Saturday. So, I stuck today's batch into into the fridge to cool to pitching temperature. How long would it take for five gallons of wort to go from 80F to 70F in this situation? I've been scouring the internet for some kind of calculator, but I'll be damned if I can find one. Any advice would be appreciated.