I use a DJI Phantom 3 Pro with 12 MP camera and 4K video on every roof when the weather permits. This is because I have a military service-related disability that prevents me from walking on roofs. The time it takes depends on how bad the roof is! If it is in good shape, I take some good pics of vents and penetrations, check the gutters for blockage, examine chimney for flashing, cricket, chimney cap, etc. Usually, I am done in < 15 minutes on a good roof and that includes set up and tear down! I believe the Mavic Zoom is superior because it has collision avoidance and a zoom camera. That will be my next drone.
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