Wondering if anyone studies full time study load and is the primary carer of their kids as well?

Thoughts, experiences... How do you find it? What is your situation? What falls by the wayside?

I am trying to work out if I am able to do 30 hours next semester or 20. I will have DD1 in kinder and will be able to put DD2 in FDC 1, maybe 2, days a week. My work hours are totally flexible. I really just want to knuckle down and get this thing finished, but just wondering if I am totally crazy or if anyone else studies full time hours as well.