I completely understand the sentiment - 40% seems like a lot to be "burning" for the sake of the other 60.

But it's helped me to think about this in a different context: think about the time you spend with your spouse. How much of that time is taken up with "life's necessities" like doing laundry, dishes, prepping meals, cleaning, more cleaning, driving places, even arguing and getting hurt are all part of relationships... And all that stuff takes time and it's not a nice meal out or a walk on the beach or an impromptu dance session. There's a lot of the mundane in our most treasured relationships, and the only people who have a problem with that are teenagers.

Should work/life really be any different?