Depends upon code, position(s), thickness, process, etc. Does client have a WPS to weld from?
Generally I charge a flat rate that includes two plates for D1.1 all position, a WPS to work from, cutting, bending, and paperwork. They pay up front so I don't have to worry about getting paid if they bust out.
I generally don't stop a test in the middle even if observation has determined that they are already failed. Let them finish. After they leave, do what is required. Cut and bend only if progressive VT was OK and final VT is OK.