You are doing demolition on a 4″ thick concrete slab using an air hammer. The slab is 5500 sq.ft. total. You have completed 35% of the job. How many Man-hours are left to complete the job?

You are doing demolition on a 4″ thick concrete slab using an air hammer. The slab is 5500 sq.ft. total. You have completed 35% of the job. How many Man-hours are left to complete the job?