A mathematical question regarding national debt .

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Imagine the UK national debt as a pile of £1 coins and you had the job of counting them out , how long would it take if you could count one per second and you worked non stop 24 hours a day 7 days a week . Assume National Debt as being £1.2 Trillion . I did try working it out but the numbers appeared too large . Also , if you placed the coins on top of each other how high would the stack be .