The series famously shifted toward much longer, "movie-length" episodes in its fourth season, making it nearly as long as the first two seasons combined. Seasonal Breakdown Runtime (Minutes) Runtime (Hours) Key Highlights 8 episodes; introduces the Upside Down. Season 2 9 episodes; expands on Will's trauma. Season 3 8 episodes; set at the Starcourt Mall. Season 4 9 episodes; features the massive 2h 30m finale. Total 2,110 mins ~35h 10m Note: Estimates vary slightly based on credits. Binge-Watching Strategy
Eleven episodes, each roughly 42 to 55 minutes. The premiere runs a tidy 47 minutes; the finale stretches to 53. The total runtime for the season that started it all comes to approximately 6 hours and 35 minutes . You’ll finish it in a single night, bleary-eyed, convinced you hear Demogorgons in the heating vents.
If you were to watch in a single sitting, the total runtime is approximately 26 hours and 9 minutes.