There is a workaround somewhere where you hack a configuration file to adjust the frame rate of a Lightroom Classic slide show. People used it to export basic time lapses from Lightroom. If you want to try that, you’ll probably have to do a web search for it. I’m not sure if it still works.
But it might be easier to export all of the images into a folder and string them together in any video editor. Because you use a Mac, for many years your Mac has already included a free app that can do this, QuickTime Player:
1. In Lightroom Classic, export all of the edited images to a folder in a common image format such as JPEG. Be sure to use the file renaming feature to add a sequence number to the beginning of each image to keep them in the order you want when sorted by Name.
2. Open QuickTime Player.
3. Choose File > Open Image Sequence.
3. In the Open dialog box that appears, go to the folder containing the still images you exported from Lightroom Classic.
4. Choose Edit > Select All, or press that command’s keyboard shortcut.
5. Click Choose Media.
6. A dialog box appears with video options such as Resolution and Frame Rate. Set it the way you want.
7. Click Open. QuickTime Player creates a new video where each still image becomes one frame. So if you selected 30 frames per second, each still image appears for 1/30th of a second.
8. Save the video.
If you want more control over the frame rate or other video settings, you can instead use a video editor such as iMovie, Adobe Premiere Pro, or Apple Final Cut Pro. Most video editing apps have a similar feature where you can point it to a folder containing a numbered sequence of still images and it will assemble them into a video on a timeline. In there you can customize how fast it plays, by altering the still image durations or the timeline’s playback speed or frame rate.
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