Recent Mass Shootings and the time they lasted.

Borderline Bar and Grill. 20 minutes before killer committed suicide. Police had not stormed the building.

Pulse Night Club. 3 hrs 15 minutes. Police shot and killed the shooter.

Marjory Stoneman Douglas. Shooter inside the school for 7 minutes, apprehended by police 3+ hours later. Police entered the school exactly 30 minutes after the shooting was reported.

Virginia Tech shooting. 12 minutes, SWAT entered and killed the shooter

Sandy Hook shooting. 9 minutes, shooter committed suicide and then police entered the building.

Santa Fe High School. 30 minutes, police injured shooter.

Las Vegas shooting. 15 minutes shooting, 1 hour to breach the hotel room

San Ysidro McDonalds. 1 hr 15 minutes until police shot and killed the shooter