Give or take an hour or so.
No.
He was active 10 minutes.
Not sure where you’re reading an hour or so.
Listen to the LVPD dispatch audio on LiveLeak or Youtube. It took 17 minutes from when the first call came into 911, until the police were at his room. In the audio, you can hear an officer say, I am on floor 32, near room 135. A security officer has been shot in the leg and is by the elevator.
The question is why did it take swat another hour to enter the room? Probably concern about a bomb or something in the room. The police officer notes there have been no shots fired for a few minutes. So maybe they thought the risk has subsided. I suspect the shooter killed himself after the shootout with the security guard.
But definitely it only took 17 minutes for the police to find the exact room. Pretty good, actually.