Cockroaches can live for about a year.
On average, cockroaches live for about a year. These insects are quite hardy, although some people think they can simply starve to death as a means of pest control, as if a building was left empty without a food source for too long. In fact, the opposite is true, as the insect can go about a month without eating anything. Likewise, cockroaches can survive on things most people would not consider suitable food, even for insects. For example, they can eat things like glue, paper, and even shoes.
Although cockroaches can live for about a month without food, they can only live for about a week without water. In fact, even without a head, they can live for about a week. The only reason they die without a head is because they cannot consume water without a mouth. Interestingly, cockroaches can even live for quite some time if the heart stops.
Many people have heard that after a nuclear war, cockroaches would be the only living things to survive. While this claim is widely made, there is no concrete scientific evidence to prove it. However, there is scientific evidence to suggest that cockroaches and similar insects are better able to resist radiation than other life forms. Cockroaches can withstand up to 15 times the amount of radiation a human can, but when compared to other insects, they are not unusually resistant to radiation.
The reason cockroaches may be able to withstand radiation better than humans is the fact that their cells divide more slowly than humans do. In these insects, cell division occurs only once during each molt period, and at most they molt only once a week in their juvenile stage and never in their adult stage. This means that if radiation exposure is transient, cockroaches that have not molted during that period would not be significantly affected. Any remaining radiation would have the potential to damage your cells, however.
These insects begin their life cycles in egg capsules, which are discarded just before they hatch. A female German cockroach, for example, can carry around 40 eggs. It takes about three to four months for an egg to develop, from birth to nymph to adult.