Mmmmh....I don't think that it is because I have a real life outside the net - I don't - but because my parents call me 'addicted' and shush me away from the computer after 2 or 3 hours.
I'm usually on 1-3 hrs. a day! I just like checking in and seing what's going on! PLUS the fact that others in the house "NEED" to use the computer limits my time on it! OH well, It's like a ritual now! I have to go online to see what's up!!