Depends on the area and how much property I' m working.

Obviously the amount of territory correlates, roughly, with the number of birds.

If I' m hunting a 40 acre parcel, where I know birds frequent, I' ll set-up and call till noon. If I' m hunting another area with 100' s of acres, I' m up and running about 2 hours after daylight if I think the birds I' ve been working are definitely not coming in...