Do I Need To Have Fun?

I have a question to myself. "Do I need to have fun?"

I thought I didn't need to have fun anymore because I was doing what I wanted to do. Then, recently, my thought changed. I want to have fun by doing something different from what I am doing most of the time.

This is not because I don't like what I am doing. I just want to have variety with my life, something refreshing and enjoyable. 

Then, I have another question. "How much time can I afford for my hobbies?" Because it is so enjoyable that it can be addictive. There is a risk to damage my main activity. "Balance" would seem to be the answer but it doesn't answer anything at all. How do you know the right balance? What if your hobby is your real passion rather than what you are doing right now? I think "Follow your heart" would be the right answer. Your hobby might be transformed into your carrier, which you enjoy.

I have two things to do for fun and have been doing them for about a decade. They are just for fun for me at the stage of my life.