I just brewed Ed's Oktoberfast ale. I have a 25' 3/8" immersion coil that I use for shilling. Even in the hottest month of the year I was able to cool 11 gallons to 70 degrees from boiling in 20 minutes! I can't wait for my system to be done, for all I know my wort may be cooled by the time I think about cooling it down
I guess having a deep well comes in handy sometimes!