Honestly, it’s quite possible (and incredible, when you think about it) that the entirety of the first Star Wars takes place over the course of just three days.

Day 1: Vader captures Leia and her ship, 3PO and R2 land on Tatooine with the plans, get captured by the Jawas that evening.

Day 2: Owen buys 3PO and R2, we’re introduced to Luke, watch him clean the droids, see the Leia hologram, Binary Sunset, etc. Ends with R2 running away.

Day 3: Luke searches for R2 first thing in the morning with 3PO, gets attacked by sand people and meets Obi-Wan. Goes to Obi-Wan’s hut, learns about the force, gets lied to about his father. Owen and Beru get killed, Luke finds out, goes to Mos Eisley with Obi-Wan. They meet Han and Chewie, set course for Alderaan.

We know for certain THAT much took place over three days at least. The question is how long it takes them to get to the Death Star by hyperspace. It certainly feels to the viewer–or at least it always did to me–like they arrive at the Death Star on the same day Alderaan gets blown up which was the same day they took off. And the state the place is in when they get there seems to support that. Obi-Wan “feels” the disturbance in the force at the time it happens too.

Anyway, they get to the Death Star, rescue Leia and Ben dies - that clearly all happens on the same day, and then you would think since the Death Star is about to destroy the rebel base and there is no time to evacuate apparently that time is of the essence. So it seems like the whole battle takes place later that same day, or it always felt that way to me. Though again, because they get to Yavin via hyperspace we aren’t 100% sure how long it took them to get there.

At any rate, it does make it seem a bit strange that Luke got such an emotional attachment to Obi-Wan after only truly knowing him for a few days and only thinking of him as a bizarre old hermit before then.