I work 3 days per week (Mon, Tues,Fri) I'm a teacher and work 8-4.30 or so and I have two kiddies. It's not always easy but having systems/routines helps. I try and grocery shop on the way home and do a bit of basic housework each day. I did get a cleaner once a fortnight to do the heavy cleaning which makes an amazing difference. My biggest challenge is my DH commutes and is gone from 7am to 7.30pm so no help with dinner, bath, arsenic hour! My saving grace is an amazing daycare where my kids are super happy and learning heaps AND they provide all meals, including breakfast, which makes the morning rush much easier.

I think 30 hours over 3 long days would make it very hard and spreading it over 4 would be easier on all of you. Good luck with your decisions!