I generally worked 50-60 hours each week. My fellowship was at a community hospital, so I suspect my schedule was a bit more humane and flexible than the schedule might have been at a tertiary medical center. I actually had time to read, complete a research project (one that I later presented at a national conference), prepare a few presentations, study for boards, and attend some conferences. I also had the chance to "meet" my child, who had been born while I was a resident.
When you are doing what you love, you will love even the doing.
That being said, my fellowship year was the year that I discovered who I was professionally and learned to balance that with a fulfilling personal life. Without that essential balance, it is incredibly challenging to sustain a career based on treating suffering and caring for the dying. For what it's worth, my advice to you is to seek out a fellowship program that honors that need for balance.