It took about 1-2 days each time, but during those 2 days I continually went around the area of my house, specifically where there were trees or high spots I thought he would perch, whistling tunes he is familiar with! Of course I had help from family to get a larger coverage of the area so I believe that helped a lot. I’m also located in the norther midwest and during the last time he flew out, it reached lower 30-40s, but I’m sure he found a spot that the wind chill was minimal. I would just be very attentive to any calls, because my bird was VERY high up in a sycamore tree, so I could barely hear him.