I have a job I need to bid.Its a simple clean and seal of about 1500 sq. ft. of unfilled tumbled marble on the first floor of a home.Its pretty dirty and I need to do alot of prep work.I know we all live in different markets but I am trying to see what is the best way to bid.By the foot {how much}or by the day.I think it might take about 3 days ,2 guys. I look forward to reading your responses.