The constant revision of the timeline by various sources does not bode well for a coherent investigation.
This issue seems now to be settled, and the explanation reasonable. It is now accepted by all that Paddock started firing on the crowd no more than a minute after he shot through the door, wounding the hotel employee. The time of the initial report of gunfire was taken from a hastily handwritten note by an officer, and was just incorrect. It's hard to see anything that unfolded after that as being incompetent on the part of the law enforcement people. It took the SWAT team about half an hour to get to the place, get their strategy organized, and breach the hotel suite door. Which doesn't strike me as unusually long, given the complexity of what they needed to do, and the unknown circumstances they were faced with. Paddock stopped shooting after about ten minutes, and they found him dead when they entered. Presumably he had killed himself right after he stopped shooting.
One peculiarity that had occurred to me, a very unlikely one, is: Is it possible he shot himself accidentally? He was handling a lot of loaded weaponry in a big hurry. But, like I said, that seems very unlikely. Details on his manner of death will certainly be released, and probably satisfy this minor question.
caw