Bruce Banner is studying a new element called Asgardium. He finds that Asgardium emits gamma radiation (uh oh) and has a halflife of 28 days. Dr. Banner knows that if he is exposed to gamma radiation above an average of 1.0 counts per second, he will turn into the Hulk. If the sample he is waiting to study emits gamma radiation at an average of 8.0 counts per second, how many days does he need to wait to begin studying this sample?