There's 33 aisles in the one I work in (it used to be called "Savacentre", it's more of a hypermarket than a supermarket).
In addition there's the alcohol section, electronics, pharmacy, clothing and the news bit. So it's bloody massive.
My job requires me to collect internet orders so basically I have to walk around the whole shop. You wouldn't believe the amount of utter tw*ts that just order like ten 4 litre bottles of water and a copy of Heat....arghhh. Or the ones that just want frozen stuff.
So it's generally either exhausting or very cold. Sometimes both. Rather brilliantly, it's always mind-numbingly dull.