I object to the supposed logic that WOHM's never see their children. Of course they see them less than the average SAHM but actually if you work it out its not that much less.
I work full time but am lucky enough to be slightly flexible with my hours (tend to pick up by 4 but spend evening working). My DC's spend 32 hours in nursery each week (4 days x 8 hours). For the vast majority of the rest of that time they are with me - we have no family support to come and take them out. We might visit family or family might visit us but they don't take them out or anything.
Anyway. So taking the extreme of the SAHM situation - the mum spends all her time with the DC's. There are 168 hours in the week. 52 weeks in the year. That works out at 8736 hours a year (supposing she never puts them in a creche or has the MIL look after them for an hour or whatever).
If you take into account my full time working hours and the fact that I spend weekends with them, plus holidays, plus bank holidays, plus the inevitable snow days (!), ill days, taking to the doctor for injections days etc etc, I worked out I spend 6272 hours with them a year. This isnt taking time into consideration when someone might babysit or take them out - however no one has babysat since DD was born (16 months) and occasionally my parents take DS out for an hour or two but DD stays with me so I'm keeping the model that they are with me.
Still with me or fallen asleep yet?
Anyway, working that out as a percentage of a full time mum that works out at 72% of my time (rather than 100% of my time) that I spend with the DC's. Its hardly not spending any time at all with them is it!
You could argue that if they are sleeping then I am not parenting. However mine dont sleep particularly well and I really should get on with doing some work rather than producing random stats on MN!