As a result, it is almost impossible for a human to be in two places at the same moment. The maximum number of entries that any single athlete can receive into an event is two, since this is the limit of how many countries can participate in each sport. In practice, most athletes who qualify more than once in an event do not win again. Those who do win again tend to do so quite quickly after their first victory. Most athletes drop out of the Olympics when they cannot find a way to pay for the cost of competing. The only exception is long-distance runners who are allowed multiple entries because it takes them so long to complete an event. A high-profile runner such as Haile Gebrselassie has been known to try out for as many as five events within a single Olympic year (August 2-14). His previous three attempts were unsuccessful but he did manage to break the world record twice during his career. It is possible for an athlete to enter four events in one day at the Olympics. Such athletes are called "quadruple jumpers" because they attempt and successfully complete the highest jumping event on the program (the quadrennial quadrupole).