As of the latest available reports, That Time I Got Reincarnated as a Slime season 4 has not had an official episode count confirmed yet. Current coverage suggests a five-cour release plan , which points to a much longer run than a standard 12- or 24-episode season, but the exact number of episodes is still unannounced.

What that means

  • A cour is a seasonal broadcast block, usually around 10–13 episodes.
  • If the five-cour plan holds, the season could end up being well over 50 episodes , but that is still an estimate, not a confirmed total.
  • Some outlets are already tracking the weekly schedule, which suggests the season is actively airing, but none of the available reports in this search state a final episode count yet.

Bottom line

The safest answer is: no official episode total has been confirmed for season 4 yet , though the current reporting strongly suggests a very long multi-cour season.

TL;DR: Unknown for now; likely a long multi-cour run, not a short 12-episode season.