I do 3 x school hours days and it works really well.......until school holidays come. I then have to use Vacation care, paying a small fortune for my 3 school aged kids. I actually don't make any money on school holidays as it all goes on Daycare, Vacation care, fuel and tolls. If you can work one day on the weekend, definitely do it. I don't have that option. I can only work daycare/OSHC hours as DH works shifts all over the place!
In a perfect world I would work 4 days school hours and have all school holidays off!!!! Or work for myself/from home. Work/life balance is so hard these days : (