In the morning I feed them, fill their waterer, give everyone a welfare check, pet a few, then check for eggs. Afternoon, I go take another look, collect eggs, then feed them a snack. Before sundown, I go feed them their last feeding, do a last welfare check, pet some more, and do a last egg check. That's pretty much the everyday routine.
Definitely don't feel guilty about having to work extra hours. That's what buys all their food and other needs. There have been times when I haven't been able to give my hens much attention (I have 4 young children, too), but they are always ready to forgive me when they see that food container coming. Ha! If only everyone in my life were that easy to please, am I right?
Chickens take pretty good care of themselves most of the time. Your worry just shows how much you love and care for them, though. They do make for awesome pets, as well as utility birds.