The theatrical cut is about ; the Rogue Cut runs roughly 148 minutes — so about 17 minutes of new/adjusted footage . But the impact is bigger than runtime suggests.
The centerpiece of this cut is an entirely new sequence involving Anna Paquin’s Rogue. In the theatrical version, Kitty Pryde (Ellen Page) uses her phasing powers to keep Wolverine’s mind anchored in the past. When Wolverine accidentally slashes Kitty in a fit of traumatic rage, the mission is jeopardized. days of future past rogue cut
In the theatrical version, after Magneto moves the stadium, the X-Men escape with Kitty Pryde, who is maintaining Wolverine’s time-travel link to 1973. In the Rogue Cut, Kitty is critically injured by Stryker’s soldiers during the escape. She can’t hold the link. The theatrical cut is about ; the Rogue
It fixes the "waiting room" problem of the future timeline. It gives the Future X-Men agency. It integrates a beloved character (Rogue) in a way that feels essential rather than forced. The rescue scene creates a kinetic energy that the future segments previously lacked. In the theatrical version, Kitty Pryde (Ellen Page)
Here, his relationship with Rogue is explored deeper. We see his motivation for risking everything to save her. Furthermore, we get to see Iceman in his full "ice form" for an extended period—a visual treat that fans had waited over a decade to see done correctly on screen. His heroic sacrifice (or near-sacrifice, depending on how you view the timeline mechanics) carries much more weight here because we see him fighting for the woman he loves.
Days of Future Past remains one of the best superhero films ever made. The Rogue Cut elevates it from a great movie to an epic miniseries-style event. It reminds us that in the X-Men universe, every character matters, and sometimes, the most important battles happen off the main stage.