7. It Would Take 15 Days To Watch Every Single Episode
Give or take a couple of hours! If you ever feel the urge to watch every single story of Doctor Who ever (at least, the ones that are readily available - one day that will hopefully be all of them!), make sure you've got a lot of spare time free in your diary because it would take a grand total of 15 and a half days to marathon every episode. Suffice to say, the Doctor would be very proud if you managed to get through it, but please ensure you've got paramedics on stand by. It's gonna be a long fortnight...