From MMOGs we would see Sword Mastery, Bow Mastery, Dagger Mastery, etc. On the other hand, what about real life Time Management Mastery?
Some people would allot an hour or two daily to play online, some would play 4-6 daily, and some would play 8-12 hours daily similar to what a professional gamer does.
For whatever reason each person has for playing, I think that in gaming there are always time management issues.
For students (teenagers and young adults), you should keep in mind that gaming is the least of your priorities. Some students would even cut classes just to be in front of the computer and be with their 'online friends'. The sad thing about this is that students miss the important phase of their lives by spending much time with their online community rather than investing on friendship with real people around them. Yes, a lot would say that they also play online games with their classmates or people around their community, but what happened to traditional outdoor fun? Are playgrounds and recreational centers not that appealing anymore?
Study Time vs. Gaming Time
When I was in college, I would always make it to a point that if I spent two hours playing games then I have to double that for study time. I remember that there were times that I went to school without sleep because of that principle. It is always about self-discipline. And to quote something that I've read on a game forum before "You will never be able to include your in-game achievements on your resume." (unless you want to be a professional gamer)
Work Time vs. Gaming Time
Feeling sleepy while at work due to overnight pvp or leveling? Well, isn't it about time that you get that promotion you really wanted? If that's what you want then you have to reconsider your priorities. MMOGs come and go but professional opportunities doesn't come everyday. Like what I said before, it's all about time management.
Live your life, gamers! Always prioritize your responsibilities at home, school, or work. Go out and meet people. Explore the world. And when you're done with all of that then reward yourself with some gaming time! =)