The pavement pounding kicks off with media events in Chicago on May 14 .
The pavement pounding runs non-stop , day and night , until the entourage arrives in Los Angeles 18 to 20 days later .
The pavement pounding kicks off with media events in Chicago on May 14 and runs non-stop , day and night , until the entourage arrives in Los Angeles 18 to 20 days later .