Multiply every task by the number of children you have.
For example, you have two kids:
Making a sandwich? You have to make three.
Having a bath? You have to bathe two small people too.
Getting dressed? Once your clothes are on, you have to put clothes on two more people who wriggle like cats trying to escape flea treatment.
Leaving the house? That’s three coats and three pairs of shoes that you need to put on bodies.
Before you leave the house have you got:
Nappies?
Wipes?
Nappy bags?
Sippy cups with water?
Snacks so you don’t have to spend a fortune on crap once you’re out and they’re inevitably hungry?
Spare clothes for both of them in case they wee/poo/vomit on themselves or deliberately splash in a muddy puddle.
Don’t forget your keys and wallet!!
Brushing teeth? You need to brush three sets.
You get the picture.
It gets moderately easier as they get older and can do some things themselves like put on shoes. But generally everything takes ages and there’s no spontaneity.
Also, if you want to go to the cinema or just pop to the pub on the corner for a drink, it’s £50 for a babysitter before you even set foot outside. So you just don’t bother going out together any more. Unless you’re rich or have family close by to babysit.