To cover this type of work I prefer to work with a small team of 3.
One of the 3 to keep things ticking over, water, waste and pre spray all topped up, etc. So no hold ups.
The second to apply pre spray (microsplitters) and aggitate with a rotary and either charlie pads or bonnets.
With all soiling loosened this simply leaves me to extract at a decent pace.
Regarding the time taken, it is hard to say without seeing it with my own eyes, but at a guess 3 days and a price in the region of £1600 to £1800.
Paul