Avengers Doomsday's original cut reportedly ran 3 hours and 30 minutes.
The final theatrical version is expected to be trimmed down to approximately 2 hours 50 minutes.
That means roughly 40 minutes of footage is being cut from the film during this ongoing post production and reshoot window.
For context on what that actually means:
• Endgame's final runtime was 3 hours 1 minute
• A 3 hour 30 minute original cut would have made Doomsday the longest MCU film ever made by a significant margin
• Even at 2 hours 50 minutes it remains one of the longest films in franchise history, just short of Endgame
• With a cast this large Avengers, X-Men, Fantastic Four, New Avengers, multiple universes cutting 40 minutes means entire character arcs, scenes or subplots are being reduced or removed entirely.
(Via - @JamesMackwl)