Why does it take so long to have a wee and get shoes on?
Well, you suggest its time to go. They "just want to finish this..." and take 5 minutes to put the Happy Land people back in their beds.
They argue they do not need a wee, while dancing and holding themselves, so you make them try. Somehow during this process leggings are completely removed and dropped on the floor, and they announce that actually they want to wear something else anyway. This is usually something entirely inappropriate for the weather, often from the dressing up box.
You either let them wear this item, to save time, and because you have already argued about 3 million small things this morning already, or you argue again, and get them to change. Pick your battles.
Next you are finally ready to get shoes on (it was about 20 minutes ago you made the first suggestion) and they wont let you help them because "I can do it myself!" but this results in the child having shoes on the wrong feet. You persuade them to change them, but they somehow manage to repeat the mistake, so you have to wrestle them off and put them on yourself. This is met with sulking or a tantrum.
You are about to leave when the child realises they NEED to take a specific toy with them, one that has not been seen for some time, and you suspect may even have been lost. You lose the will to live and offer them a biscuit if they will JUST LEAVE THE HOUSE NOW.
45 minutes after the initial request to leave, you get out of the door.
It is not always like this, obviously, but factor in the fact you put your phone down somewhere when you were searching for the second sock which the child was wearing just 10 minutes ago, but has somehow been removed and discarded... and you cannot for the life of you think where your purse is (it is in the toy kitchen, having been used as a prop for a game played earlier, obviously) it all adds up.