The April 20 walkout organized by Murdock was set to last until the end of the school day , because the issue is one that needed to be '' ‘ addressed for longer than 17 minutes ’' ' . This was said in reference to the March 14 walkout which lasted for 17 minutes to mark the 17 lives lost at the Marjory Stone High School shooting , with students returning to their classrooms soon after
Marjory Stone High School shooting
Stoneman Douglas High School shooting
Lane Murdock