I've come from games and gone...
I played a TON of starcraft when it came out.... 18 hours a day on weekends, and every waking moment not at school.
Warcraft III, I was addicted, but after the first few weeks I could only max out to ~8 hours a day instead of just wanting to go all out for all 16 hours.
TFC, Addicted, but just like war3... maxed out to that amount per day. Same with CS (I think I played a little more CS than TFC).
War3 was ~2 years, got my 3000 ladder games in at like ~83%... not GREAT but still intimidating.
WoW was one year.. like feb or march of 04 to march of 05.. That was ~12 hours a day on average...
The only game that I just have that random urge at times still to this day.. is the greatest and best game of all time. It's by far the most dominating competitive game of all time. It's just the all around greatest game every created on the face of the earth and still has one of the largest group of people playing it's incredibly outdated online system even today.
I played some this evening, and the last few days.... something about it... the most incredible game ever.