How did Mark kill (you know who) in ep5

So Mark killed Conquest right, but how did he choke him to death in just a few minutes (I'm gonna be forgiving and say mark had his grip for 10 minutes) if Viltrumites can hold their breath for hours, even months (Nolan getting to a fucking black hole without a single breath). I'm not sure of how choking kills people, maybe it emptied Conquest's lungs so he had no air to go?