Over 18. if not more. I used to
- wake up,
- turn on game,
- play until I couldn't stay awake,
- goto sleep
Goto start (in other words, repeat from 1)
I didn't take any notice of time, its possible in the past I made it past 24 hours.
MMO are like that.
I can tell I am getting bored of a game by the less time I spend playing it. Eventually I don't even start it.
I don't play games constantly - it might sound that way - but there can be months when I don't play anything. I just binge on a game when a good one comes out. Until I get bored of it.