I was watching a movie with unpopular subtitles. I had to adjust the subtitles forward 10 seconds after watching for a few minutes. The movie was 2:20 minutes long. Halfway through, the subtitles shifted by -200 seconds. I realized that this was the limit and I couldn't adjust it anymore. The iPad can quickly input the subtitle time I want to adjust, but the phone can only manually fine-tune it by 0.25 seconds each time.