I feel sorry for you three guys and your horrible hours/ conditions.
The ambient temp where I live has been about 100°F this month, rising to 104° last Friday, with humidity at 90%. My workday is to work in the am, go home for lunch+siesta*, then work again in the pm. On Friday I had a longer day than usual: from 7 to 10 in the am, then back at noon for 5 hours in the pm. The worst part of the day? Commuting at midday in a car with no air conditioning left me feeling sick/faint for a big chunk of the pm.
No way could I endure the kind of working day you guys put in.
* About half the workforce have these traditional small-town hours, based round the notion of retreating from the heat during the hottest part of the day. The other half of the workforce have the modern, big-city hours of 8 am to 4 pm. This latter schedule is known as "English Hours" in case anyone forgets that it's a relatively recent intrusion into Mexican culture.