Brake Pads/Disc life

[Juanco20]

I'm looking at a few cars at the moment, one of which is the Pug 308 GTI with the massive Alcon front brakes. That is a rather large bill when those discs and pads need changing. I know it is largely down to driving style but at what sort of mileage would you normally anticipate pads and discs to require changing on that particular setup?