Depending upon the number of files falling within 1 second the resuiting frame rate varies from 4 fps (0.25 seconds per each frame) to 0.5 fps for the last five frames, when files for even seconds (33, 35, 37, 39 and 41) were missing.

The real time interval of the animation encloses the last 39 seconds if the flight within the interval from 12:35:03 to 12:35:42. Count of files (and respectively the fps rate) and their timestamps in the local mean solar time on May 23, 2021 (sol 91 of the Perseverance rover mission) are as follows:

12:35:03 (3 fps) 12:35:04 (4 fps) 12:35:05 (3 fps) 12:35:06 (3 fps) 12:35:07 (4 fps) 12:35:08 (3 fps) 12:35:09 (4 fps) 12:35:10 (3 fps) 12:35:11 (4 fps) 12:35:12 (3 fps) 12:35:13 (4 fps) 12:35:14 (3 fps) 12:35:15 (3 fps) 12:35:16 (4 fps) 12:35:17 (3 fps) 12:35:18 (4 fps) 12:35:19 (3 fps) 12:35:20 (4 fps) 12:35:21 (3 fps) 12:35:22 (4 fps) 12:35:23 (3 fps) 12:35:24 (3 fps) 12:35:25 (4 fps) 12:35:26 (3 fps) 12:35:27 (4 fps) 12:35:28 (3 fps) 12:35:29 (4 fps) 12:35:30 (3 fps) 12:35:31 (3 fps) 12:35:32 (2 fps) 12:35:34 (0.5 fps) 12:35:36 (0.5 fps) 12:35:38 (0.5 fps) 12:35:40 (0.5 fps) 12:35:42 (0.5 fps)

Timestamp for the last photo is 12:35:42, when Ingenuity has already landed at Airfield C.

The NAV camera is mounted in the helicopter’s fuselage and points directly downward to track the ground during flight.