Finishes: Colors & Stains

The show originally ran for 15 seasons, with a total of 327 episodes. If each episode is approximately 45 minutes long, it would take approximately 245 hours to watch the entire series.

Supernatural has currently aired 325 of its 327 episodes, which are all around 45 minutes each, adding up to a runtime of about 14,600+ minutes, exceeding the 14,400 minute countdown to the finale.