How long does it take shells from lobsters or crabs to decompose?

The shells of lobsters and crabs, primarily composed of chitin, can take a considerable time to decompose, typically ranging from several months to a few years, depending on environmental conditions. Factors such as temperature, humidity, and the presence of microorganisms significantly influence the decomposition rate. In marine environments, these shells can break down more quickly due to the action of bacteria and other decomposers. In contrast, in terrestrial settings, the process may take longer.