The average length of a major release has drifted upward over the last two decades, and the longest films now routinely pass three hours. The reasons are commercial and technical rather than artistic.
Projection no longer imposes a physical limit
When films arrived as reels of celluloid, length was a tangible cost. Prints were heavier, more expensive to strike and more expensive to ship to every screen showing them.
Digital distribution removed all of that. A three-hour film costs a distributor no more to deliver than a ninety-minute one, and the projection booth does not care.
The old discipline that a longer cut had to justify a real expense simply vanished, and nothing replaced it.
Cinemas still lose showings, and they price accordingly
A screen can host a limited number of sessions per day, and a long film reduces that number, cutting the potential ticket sales from that auditorium.
Exhibitors respond by allocating long films to fewer screens, running them at slightly higher prices in premium formats, or trimming the advertising block before them.
Because premium large-format tickets carry a higher margin, a long event film in those rooms can earn more per session even while offering fewer sessions.
Streaming changed what audiences tolerate
Viewers now routinely watch multi-hour blocks of serialised drama at home, and the expectation that a story fits into ninety minutes has weakened accordingly.
Filmmakers who work across both formats bring serial pacing into features, with more subplots and more time spent on secondary characters.
Length has also become a marker of significance. A long runtime signals ambition, and awards campaigning rewards films read as substantial.
Franchise storytelling adds obligations
A film embedded in a larger series carries duties beyond its own plot: reintroducing characters, resolving threads from earlier instalments and planting material for later ones.
Each of those consumes minutes that do not advance the story being told, and cutting them creates problems elsewhere in the release schedule.
Ensemble casts compound it, because every recognisable performer needs enough screen time to justify their presence.
Directors have more leverage than they once did
Final cut used to sit with studios, and a producer could order a film shortened to fit a preferred session pattern.
Established directors now negotiate control as a condition of taking a project, particularly when a studio needs their name attached to justify the budget.
The result is that the length of a film increasingly reflects the length its maker wanted, which historically was rarely the shorter option.