If I give you £1 billion and you stand on a street corner handing out £1 per second, twenty-four hours a day, seven days a week, you would still not have handed out £1 billion after 31 years!
Now read on. This is true and rather hard to really understand. The next time you hear a politician use the word 'billion' in a casual manner, think about whether you want the 'politicians' spending YOUR tax money. A billion is a difficult number to comprehend,