I work three days a week for a total of about 22 hours. I have one 19 month old girl and am pregnant. I work for the enjoyment of work rather than needing to work which is lovely. I do get very tired, especially as I'm pregnant, but on the other hand it is a desk job so it is the only time i get to sit down for long unlike life at home with a toddler. What makes it work for me is my finish time- I'm home by 4pm on two days and 4:30-5pm on one day so i do not feel like i get home and immediately have to get DD's dinner ready then our dinner- i can spend time with DD, have a cup of tea and unwind for the moment. Also DH and i alternate cooking. And when we cook we mostly cook enough for two nights so we both can have a couple of no-cook nights in a row if we are tired.