I would also add that when you are living out your passion, your work doesn't seem hard regardless of how much time you spend on it. It becomes another wonderful part of your "real life" and doesn't detract from family, friends and fun.
From experience, constantly moaning about your job will make it harder and allow it to seep into all areas of your life like a blob-monster. Make efforts to live your passion, but until then, be thankful for the job you have and follow cdn's tips above to keep it in check.
That's all I got for now.