thats less that a days work with the right equipment, and sanding, 3-4 hours the next day, but your gonna want to put in a price for 3 days, if its 600m/2 then i would price it at £2 per square meter,
then kiln dried sand is £4 per bag you will need about 10 i think, better to have more than less, then brooms and large squeegee, then a dry day within the week of doing to bricks to brush the sand in,
near enough £1500
which will pay for a basic pressure washer and whirl away. the round patio cleaner.
all good