So what they do is, let's say you take two people who meet up, and they take the number of days those two people spent together, and then they estimate how many hours were in those days — how many hours did those two people spend together?
Así que lo que hacen es, digamos que tomamos a dos personas que se reúnen, y se cuenta la cantidad de días que esas dos personas pasaron juntos, y luego se calcula cuántas horas se encontraron en esos días. ¿cuántas horas pasan juntos esas dos personas?