Y.M.
Its not about the amount of time you have with them, its how you spend the time that you have with them. I work 40 hours a week also, I have a 1 yr old, a 12 yr old and a 14 yr old and one in college. I just try to spend as much time with each of them as I can. WHen I get home from work, they come to my room and we talk about their day or I go to their room if they are doing something. Then while Im making dinner, they either help or just come downstairs and we talk while I cook. The baby is with me pretty much wherever I go. She and I go to her room at 8:30 to read a book together and have out timr together. so its basically just that you try to get as much time in where you can. We have to work so theres not much choice in that. Just make sure that you do what you can when you can and that will be enough for the kids. In my case, just showing interest in their day to day stuff is quality time.