6 hours including the trip to Home Depot for propane, and to the LHBS for ingredients. 5 hours from starting actual work to finishing cleaning up. Since this was my first brew outside with propane, this includes a bit of time for setting up new hoses, a new CFC and getting things into the right place.
This is for a 5 gallon batch with a 60 minute mash, 20 minutes fly-sparging (was aiming for 30 minutes) and 60 minute boil. Cooling in the CFC to about 78F in the fermenter, and then leaving it to cool to 70F for pitching in my fermentation chamber. I'm sure I can do it half an hour or so faster next time.