Jumbo82 is correct. I have a 15 gallon pot and a 25' immersion chiller. It takes approximately 20 - 25 minutes for it to cool 5.5 gallons of finished wort from boiling to 65F. I use tap water to start and switch to recirculated ice water at about 100F.
Primary/Secondary: #109 Rye, #110 APA
Kegged: #106 American Wheat, #107 IPA, #108 Nut Brown
Planned: Red IPA, American Brown