For me, it wasn't what I expected at all. Passions are a great distraction, but to go all in on one is not much different from working on something you enjoy.
I learned that I was much better off integrating my passions in to my life in a more sustainable way rather than trying to turn them in to a 'thing' that I was solely focused on. Perhaps I am just... less passionate about my passions than most people, but that is what worked for me.