A lizard is blown out to sea during a hurricane. This type of storm occurs very infrequently-on average once every 100 years. The lizard washes up on the beach of a small island and finds some beetles on the beach. The lizard can get an average of about 20 kcal from consuming a beetle. It takes the lizard 10kcal/min to chase and catch a beetle. What is the maximum amount of time that the lizard can spend catching each beetle without expending more energy capturing its prey than it derives from consuming it?