I work seasonally. Basically no wow at all, for 4.5 months of the year.

The remaining 7.5 months... I'll sometimes get a part-time job here or there, but usually don't bother for long stretches.
Pretty much do absolutely nothing (work related) for 6-8 weeks prior to my seasonal work and the same after it.
So that's maybe 4 months where...

Once a week go and do some kind of sports thing with friends..
Go for coffee with friends twice a week..
Pay bills get groceries etc..

And of course, get up... play wow.. eat.. play wow.. eat.. play wow.. go to bed.
I've had days where I get up and wow for 14-15 hours and sleep.
And then repeat the same for say 4 days in a row.
And do this for 6 or 7 weeks in a row.

In EQ on my main, my /played time was over 3 years. That for a game which was 7 years old at the time I quit.

How much time you play is relative to how much free time you have.
And also to the hobbies you find enjoyable.

If you want to spent 100 hours a week (including weekends) that's up to you.
If 10 hours is enough time, that's fine too.