how many times do you have to stomp on a cockroach to kill it?

The number of times you need to stomp on a cockroach to kill it can vary depending on several factors, including the size and species of the cockroach, as well as the force of the stomp. Generally, one strong stomp is often enough to kill a cockroach due to its relatively fragile exoskeleton. However, in some cases, it may take multiple stomps if the force isn't sufficient. It's also important to note that cockroaches can be quite resilient, so a direct hit is typically more effective.