Pre-2000, if there are fight scenes of any sort with recurring non-boss enemies, the footage will be recycled at least 3 times throughout the series. See: Macross, Gundam, etc.
If the series has more than 13 episodes without a "LOL FIRST SEASON SOLED GUD LETS MAKE ANOTHER SEASONZ" break in the middle, there will be a recap episode consisting almost entirely of recycled footage, perhaps with about a minute of new footage consisting of a major character in some sort of hearing/briefing telling their superiors about everything that's happened. Of course, the audio track will be new, so you still have to watch it for extra insight and "Daym, she haz 1 hawt voycse."
But at least it's not one of those minute+ scenes in Evangelion where the frame doesn't change at all, and you're not sure if the file's corrupted or something. IT'S BUILDING TENSION SO YOU'RE RELIEVED WHEN SOMETHING HAPPENS. LIKE IN MUSIC.