How long were episodes in season four of the original The Twilight Zone?

Episodes in season four of the original The Twilight Zone were 51 minutes long. They occupied an hour-long broadcast slot, but the stated runtime excludes commercials, making 51 minutes the canonical answer rather than 60 minutes.

Season four aired on CBS from January 3 to May 23, 1963. It was the only season of the original series to use an hour-long format. Earlier seasons generally presented half-hour episodes, while season five returned to that shorter structure.

The expansion happened because CBS needed The Twilight Zone to fill the time slot formerly occupied by Fair Exchange. Rod Serling disliked the change because he believed the show’s compact stories worked best at half an hour; extending them risked adding unnecessary subplots and a more conventional soap-opera structure.

The season also introduced a redesigned opening featuring floating objects such as a door, window, clock, eyeball, and wooden doll. Because television listings described the episodes as occupying a one-hour slot, viewers sometimes answer “60 minutes,” but the program’s actual episode runtime was 51 minutes after advertising time was removed.