I've not read every reply but in answer to your question , I've no idea , you just do what you have to do to get through !
I had 2 babies in nursery and a school run a few years back , my house was permanently a work in progress , I gave up ironing altogether , and went to bed when the kids did , routine was non exsistant as babies tend to want to do their own thing 
5 years later ,I've got 2 in primary school and 1 grown up in ft work , I'm up at 6 to walk the dog before dh goes to work ,back at 6.30am do a bit of a whip round before kids get up (empty dishwasher , stick a load in the washer ,chuck a bit of bleach at the bathroom nothing too strenuous) ,kids need to be dressed by 7.30 , leave them to it whilst they eat breakfast and I get myself ready , in car by 8.30am ,school drop then on my way to the office .
Dh usually does pick up as he finishes before me ( he had to talk to his boss to make this happen as I was burning out ) he starts tea and once I get in we eat , I clean up and he puts kids to bed , dog gets another walk at some point but whoever can be arsed at the time !
Evening is then our own ready to start the well versed routine the next day ..
In short , it gets better ,easier and so routine you don't even notice its happening
And occasionally I even stay up after 10pm
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