Hard to tell especially if what Rowan said in the interview is true and the agency pulled a different bus from the route to take them to Santiago.
Let's they use the Bus that leaves Iquique at 14:00 and arrives to Santiago around 16:20. 26 HRS
give or take, because of multiple stops on the way, it usually is 27 hrs.
That Bus arrives around 9:50 of the next day to Coquimbo (where they would've left the pack) Almost 20 HRS
The next bus to leave would do it at 10:30 and according to the agency website it would arrive to Santiago at 15:50. Almost 6 HRS
So I'm quite confuse on what actually happened to them.
Rewatching the footage it says that Rowan&Shane arrived to Santiago at 19:03 and to do that they should've take the bus that leaves Coquimbo at 13:00.
Also it says that the 2nd bus arrived at 18:44 to Santiago from Iquique, and to do that they should've take the bus that leaves Iquique at 17:30.
I'm guessing there is something hidden there. Something happened between the departure of Iquique and the arrival to Coquimbo and Santiago.