Getting back on topic and away from real world homocide, I don’t get why people think time dilation is necessary to explain TESB’s timeline. The Falcon’s trip probably last a long time, long enough for Luke to train up, and more importantly, his training seems pretty negligible, going by his performance against Vader. That is exactly the sort of results you’d expect from a student who only trained somewhere between two days and a month. Vader’s toying with him and still demolishing him.