Frontier says there are just over 1200 players that have played more than 1000 hours since launch. That's and average of 4 1/2 hours every day since December 16th (so they aren't including beta or alpha).
I think I might be one of them, but I may be a little shy of the total. There have definitely been weeknights where I've put in 5-6 hours, and weekends where I've put in 10-12 hours a day, but I've also taken a few breaks and don't play as much as I used to. I kind of wish they had a stat you could look up, but I'd be a little apprehensive to see what it could reveal.
So where do you think you stand?