that seems odd. i don't have a wort chiller, and do two 3gallon pots (split my wort down the middle) to get 5 gallons.
I just do a water bath and can get my wort to 70F in like 45 minutes.
sure i'm dealing with less volume, but I also have to cool from the outside-in, rather than direct cooling with a chiller.
is your tap water warm? too low a pressure? how big a wort volume? 5gal? 10?