The length of "Friday the 13th" varies depending on what is meant by the question:
- If referring to the first original "Friday the 13th" film (1980), it runs for about 91 minutes (1 hour 31 minutes).
- If referring to "Friday the 13th: The Game," the main gameplay typically lasts around 5½ hours, whereas players aiming for full completion may spend significantly longer—up to 132 hours.
- For the overall "Friday the 13th" movie franchise binge, including all original movies and reboots, the total time is about 7 hours and 31 minutes for some abridged sets, or more than 18 hours for the full marathon including reboots.
If the question is about how long a specific Friday the 13th day lasts—it is a normal 24-hour day. But if it is about the movie/game experience, the above timings are relevant. Please clarify if you want details on a specific movie, game, or another context.