I have no idea. 2000 hours is roughly 83 days (morning, noon and night, no sleep, eating, school, work or life), which seems like quite a lot to me. But then again, I assume it's possible when it's spread over 8 years. (say 10 days a year, which is 240 hours, which amounts to roughly 40 minutes per day, assuming you'd play every day). All I know is that I used to play way more than was good for me.