The bump-stock narrative is a red-herring. They are a gimmick. The guy had upwards of a quarter-million dollars worth of fully-automatic weapons in that room. Everything he did Sunday was already illegal.
Where are you getting news from? I saw nothing about 2 shooters, but I haven't looked at the news yet today and it was roughly 10 to 15 minutes of sustained shooting. If that.
From what I have read this afternoon he was shooting for 9-10 minutes, but it took them 72 minutes to get inside his room. They apparently had a lot of difficulty in locating him and it seems Shot Spotter is not being used in Las Vegas.