I work on a freelance basis and DH works FT on shifts, so we manage to get a day or two together and most evenings if he's not working. DH has insisted since we first had DCS that we get one evening alone per week (this is more like once every 2 weeks in reality, but it is so nice to go out for drinks/dinner just us two).
However, sometimes if I am busy with work we are like passing ships in the night, when he's at home, I try to plan work. It's hard to get a balance.
You all sound like very hardworking people, which is highly commendable and necessary, from the sounds of your post.
Try not to make life all about work though, I will never forget my friend being in hospital with cancer for the second time, hair falling out and looking tiny and weak, and her asking me how work was going (had quite a full on job at the time) and she told me that "life is for living, not for working yourself to exhaustion".
Apparently a common regret told by people who are about to die is that they didn't work so much and spent a bit more time with their loved ones.