Hi,
One man could bang that out easily in under a day, it's only 10m x 20m and nice sized slabs too. Won't get much sand etc in run off.
I would go over it first with a hot wash lance only to get rid of gum and then go over the whole area with fsc cleaner. Doing the gum last will probably leave clean spots.
Spot on with price I would think.
Cheers,
Huw