I hate Mommy Guilt - but I am where I am right now for a reason. That's what I tell myself anyway. Like during the week I do not feel like I get enough time with my son due to work/commuting. On the weekends I spend every waking moment with my son. What also makes it a little easier with working is that we took him out of the child care facility where he was one of 27 3 yr olds and now he's in a very loving in-home care. Knowing he's well cared for all day long, with lots of hugs, attention, and curriculum makes it easier.
Easier, but never goes away.