This was the hardest thing I ever did; took seven years. It is also one of the most rewarding things I ever did. A PhD is no joke, and they certainly don't give it away. In other words, the program was very academically rigorous. There were many times I would lye down at night and wonder if I would ever finish it. This is not for everyone. Your writing skills need to be top notch. Also, a doctoral dissertation is nothing like a master's thesis. They are very different animals.