If it was a regular 12 hour Pit Stop then they would have started at 12:51 am on April 26th (Ken & Tina). They said nothing about the flights
Our best possible flight construction would have them reaching La Paz at 8:00 pm also on the 26th. So, after sleeping with Simon Bolivar, they would have awakened on the morning of the 27th.
And they arrived in darkness at EL Alto airport La Paz, so the 8:00 pm is okay. But we know that all the activities happened on April 28th from our spoiler witness. One day unaccounted for.
I guess it has to have been an extended Pit Stop in Forteleza. Lots of time to toss underwear about. This was not where we expected one because we are sure there has to be one in La Paz. And I don't remember there ever being extended Pit Stops back-to-back before.