I guess its like anything. It depends on your situation. As mentioned, if its a hobby, then as long as your life is not being put aside, I think no worries. But like any hobby, if your goal is to get better, then you need to invest some time. Think of a runner, or a weight lifter, or a martial artist, or a dancer, or a musician (all as hobbies) You only get out of it what you put in. It can, however, become an unhealthy obsession. That is your responsibility to make sure you have a healthy balance in your life. It can become like a video game- I use this example cause there are many people who get obsesed with these and neglect their lives just to reach the "next level".
If you want to pursue it as a side - or main - income, well, its a job, and you have no choice but to spend a lot of time doing it. There are many things that need to be considered before making any kind of decision to do this however.
This is not an easy question to answer because there are so many factors that will need to be considered.
You have a life, and it is not poker. Poker may be a part of your life, but life should not be poker.
I play a lot, and playing has become a priority in my life. As my daughter is. As my health is. As my family is. As my social life is. and so on.-.......