ERT occurs when an amusement park sets aside one or more rides in their park for use by one group. ERT sessions commonly last for half an hour to an hour per ride, though they are sometimes longer. They usually take place before the park opens or after the park closes. Coaster Crew events often have ERT sessions on multiple rides. Parks that offer early entry and early rides to their season pass holders essentially give them an ERT session which is open to a broader audience than our group’s.