I was watching MSNBC Sunday night, October 1st. I watched/listened to the very first reports - including the sounds of the rapid-fire gunfire.
Then later (again) hearing the audio of the shooting on all the cable news channels (including the recently released bodycam video/audio), I have zero doubt that the shooter fired thousands of rounds during those 10 or so minutes of shooting.
There is no conspiracy here. According to reports:
Officials said that 12 of the rifles found in the gunmans suite were outfitted with bump stocks.
https://www.nytimes.com/2017/10/05/business/bump-stocks.html
Are folks suggesting that we're being lied to by the Clark County Sherriff's Department and by the FBI about the number of rounds fired?
If so, then anyone who was asleep when this heinous attack occurred - let me tell you - I heard the gunfire in the earliest news reports. It was no lie.