Can anyone give me a guide as to the time it would take to remove the gearbox, replace the clutch and pressure plate and re-install the gearbox to the car.
Thanks

 

That depends if you have the right tools, eg a concrete floor and transmission jack and how experienced you are.

An entire weekend to get it apart and another weekend to put it back together ???
There're some pretty tight bolts to get at on the bell-housing.

If you're going to do all of that, then most would resurface the flywheel.
Replace the rear crank shaft seal as well ???