"¿Cuánto tiempo nos queda?" (How much time do we have left?) sounds like a tired late-night spiral set to a beat. The chorus is short and flat on purpose: "Es una tontería, no me queda energía" (It's silly, I've got no energy left), then the title question and "hasta que sea de día" (until it's daylight). It feels like someone lying awake, counting the hours.
The verses explain why sleep won't come. "Esos recuerdos que se juntan antes de dormir" (Those memories that pile up before I fall asleep) keep coming back, and his answer is the blunt, repeated line "Hazme un favor y mátalo" (Do me a favour and kill it). He is not talking about a person: the "it" is the memory, and later it becomes mátalos, kill them, all of them. It is a dramatic way of asking someone to make the thoughts stop. A useful phrase to grab here is qué más dan, as in "Qué más dan esos días", a very Spanish way to say "who cares about those days".