20 Minutes or so. Its located infront of the o/s/f wheel, behind the plastic arch liner. In a nutshell, ignition off, jack/stands o/s/f wheel, wheel off, arch liner off, undo bolts holding it to chassis (2 or 3, 10/13mm or T20/30) unclip block plug (can do it from top, or threw(sp) the arch)
Bolt the new one on, some of these can come modified very slightly but will still go on, you may have to add/remove the bracket as need be, only the way they are held onto the car is changed.