Absolutely, but for me, I sacrifice more than time. I sacrifice monster
hands when I probably don't have the nuts. I sacrifice my position when dweebs are going all in preflop against my AK with 120BB and I fold because I know that may not be a winning play. I sacrifice days when I should be focusing on other chores/tasks. I have a family and I do my best not to sacrifice anything for them, but at the end of the day, I find that I do that a little too. And yes, absolutely, I sacrifice many hours and hell I even sacrifice my sanity sometimes. Being sucessful in poker deserves a lot of sacrifice, but I mainly look at it as disciplined sacrifices. For instance, are you willing to sacrifice all your remaining chips on that AK, would you sacrifice your whole
bankroll on one game, would you risk starting a tournament when you have been up for 14 hours. No, you probably shouldn't, these are not real sacrifices, these are bad decisions. As for poker, praticing discipline and using it as a strategy will limit how much actual sacrificing you need to do.
A person that plays as much poker as they can and does not sleep right, eat right, exercise right, and take time for their mind to relax will be doomed in poker. It stands to reason that success in poker does not always come down to sacrifices, but discipline and patience. Skill will always trump sacrifice because in the end you don't give up anything.