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Actually, my reply above is still applicable here. Please check if the indexing is still going on (new files are added to Recents album). If they are, then this is just time prediciton issue. As I can see on the screenshot, it is crunching video files. Those are harder to process than photos and take more time. If program started from photos, it can initially came up with more optimistic estimation, but once it started doing videos, that estimation may not be applicable anymore. As I said, this is just prediciton, program just does not know, it estimates.
However, if there are no changes to the Recetns album, then there could potentially be some sort of error or corrupt file, and program is indeed stuck on it. But let’s not jump into conclusions right now. Can you please check?