Via Screenrant.com:

Warning: Spoilers for Star Wars Rebels Season 4

Star Wars animation has always pushed the boundaries of what we know about Star Wars, especially when it comes to the Force, be it the introduction of new Force powers, the introduction of new factions of Force users, or the introduction of pocket realities within the Force. Star Wars Rebels continues this strong tradition by bringing time travel to the Star Wars universe.

This is not the first time Star Wars has played with time. In fact, time-bending has happened even more than most fans realize, with Luke’s training on Dagobah in The Empire Strikes Back possibly serving as the first example. While it wasn’t specified at the time, more recent canon has shown that various Force Nexus – places where there’s an abnormal concentration of Force energy – can result in a time dilation effect. This is why Luke was able to train as much as he did with Yoda in what seemed like only a few days in Han, Leia, and Chewie’s trip to Cloud City.

Another time this happened was in The Clone Wars when Obi-Wan, Anakin, and Ahsoka stumble upon Mortis. Mortis was a far more powerful conduit than Dagobah, so it may have seemed like the Jedi spent several days there, they only went missing from the rest of the Republic Fleet for a second or two.

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