A recent Pew Research Center survey found that only 21% of working mothers consider full-time work an ideal situation. That is contrasted to 72% of fathers who consider full-time work ideal. A solid majority of working mothers (60%) would prefer part-time work and 19% would prefer to not work. Interestingly, only 48% of "not working" mothers considered not working to be ideal. 33% would prefer to work part-time. For more fun check out the thread on this study over at Times and Seasons. They're always good for a variety (and I mean variety) of Mormon perspectives.
These results seem consistent with what I've found talking with some of the female graduate students at my university. They feel trapped on the full-time career track and want alternatives that are family friendly--either to work part-time temporarily while the kids are young or to get out of the full-time career track altogether. A lot of this dilemma is probably a function of job benefits. Women who would prefer to work part time may feel stuck in full-time positions because their husband is self-employed or works for a small business so a full-time job is the most affordable way to obtain health insurance and a retirement savings plan.
Another interesting finding was that higher education negatively correlated with how high mothers ranked their own parenting performance. The same was true for employment level. Stay at home moms ranked their own parenting higher than part-time moms and part-time moms ranked their own parenting higher than full-time moms. I didn't see if they controlled for employment with the education result, otherwise I would expect that the education result is just a function of highly educated women being more likely to have full-time and part-time employment.