And now I think I've figured out that with the frame rate set to 2 fps for parking mode instead of 1 fps, the video file is the same 2:00 minute clip, but only spans a 30-minute time lapse instead of an hour. This results in a playback speed that appears half as fast as with 1 fps. But the total number of frames in a 2:00 minute 2 fps file is the same as a 1 fps file. 30 minutes x 60 seconds per minute x 2 frames per second = 3,600 frames per .mp4 file.
So it looks like the way this "parking mode" works is, it will always generate an .mp4 file that takes 2:00 minutes to play back, and the file will always have 3,600 frames no matter what your fps setting is. The amount of time lapse captured in the video will depend on your fps setting. If fps = 1, time lapse = 60 minutes. If fps = 2, time lapse = 30 minutes, etc.. The higher the fps setting, the slower the playback speed appears.
So based on this pattern:
1 fps = 2:00 .mp4 file with 3,600 frames covering a 1-hour time lapse.
2 fps = 2:00 .mp4 file with 3,600 frames covering a 30-minute time lapse and playback speed is half as fast.
3 fps = 2:00 .mp4 file with 3,600 frames covering a 20-minute time lapse and playback speed is 1/3rd as fast.
5 fps = 2:00 .mp4 file with 3,600 frames covering a 12-minute time lapse and playback speed is 1/5th as fast.
Also, I think the SGDCHW Hard Wire Manual may need an update. Page 7 of 12 says the options available are 1 fps, 2 fps, & 5 fps. But then page 3 of 12 says 1, 3, or 5. And I believe the actual dash cam itself has more options than that, like 1, 2, 3, 5, 30, or something like that. Because we're the oddballs here in the U. S., it may also be good to include both cm & inches and degrees C & F in manuals for U. S. customers.