I have a TS400 with diamond blades we usually use wet for cutting pavers etc. I had a call from a customer that just needs a cut made in a slab on grade. Probably 4-5" thick. Not exacctly sure of the length but based on what he described about 3ft. Never had a call for this before. What should I charge him? Per inch cut? I think if I charged time I would not really make out as it should only take a 15 minutes with setup. He is not the type of guy to go rent so I know he will pay for the job.