It depends on two main factors:
Fly height, which determines the GSD (ground sampling distance, which is the distance between pixel centers). This parameter, despite the performance of your aircraft, could have a maximum value, restricted by the legislation in your country (In Chile is 400 ft ~ 122 m).
Camera resolution and FOV (field of view), because the covered area is depending on the number of pixels in each image, as well as, the possible correction that you need to perform to remove the distortion present in image edges.
Also, the app that you use for capturing the images could restrict the maximum covered area, based on the distance from the origin point and the battery autonomy.
I have used both, Phantom 2 Vision Plus and Phantom 3 Advanced, and I can tell you, at 100 meters height, you can cover at maximum 2.6 and 2.2 hectares per image, respectively. The value indicated for PV2+ is lower after correction due to its fisheye lens.
In my work (forestry), we developed several tests, and we obtained when 80% of overlap is used, an average of 3 and 10 orthocorrected hectares per flight (approximately 10 min), for P2V+ and P3A, respectively. We used Pix4DCapture app to colect the images.