0100 - arive at alderaan's remains
0130 - Falcon is in the docking bay and the scanning crew gets there on the double
0150 - Gang ambushes troops and steals their armor, hops into control booth
0200 - R2 finds the reactor, Obi-Wan leaves
0210 - Han and Luke run off to try and find Leia
0350 - after much travel (because it is a huge ass station) Han and Luke find the detention center
0405 - Leia saves their skins
0415 - gang escapes trash compactor, and head off for the falcon
0600 - reach over pass where the falcon is, gang separates
0630 - gang reunites by falcon, Obi-Wan dies
0635 - falcon escapes death star
(For nice round numbers I say it took them 12 hours to reach Yavin 4, I'm sure a few of them got a couple hours of shut-eye)
6:35 PM - gang reaches the Rebel base
6:40 PM - Leia instructs the commander to work on R2 right away (since she knows they were all tracked there), Luke meets up with Biggs and takes the X-wing pilot test
midnight - Information is decoded and a weekness has been found
Day 5:
0100 - pilots assemble, doubt the almighty power of the proton torpedo
0200 - death star approaches, pilots scramble
0230 - attack on death star begins
0300 - death star gets blown the hell up
0320 - Luke is mauled by his new fans, R2 heads off for repairs
(at this point, everyone is very tired, but thrilled. The rest of Day 5 is devoted to cleaning up, getting some sleep, eating something, and getting ready for the awards the next day)
Day 6:
Party!!! Woo!
(I take creative liberty in saying that the info in R2 was decoded in 6 hours or so, mostly because the information wouldn't be that hard to read since it is all digital and computerized and the whole gambit. Also, the Rebels had an incentive to find a weakness quickly since they knew that Leia had been tracked, and further proof off that would be that the Death Star did indeed show up just shortly after the Falcon did.)