The price moves with what's in the concrete and where it sits. A thick slab with rebar, the steel bars set inside to hold it together, takes longer to saw than a thin, plain one, and a wall cut takes more setup than a floor cut. How many cuts and holes you need, and whether we're working inside your house or out on the driveway, matter too.
The schedule turns less on the saw than on what has to happen before it. We need to know whether the slab is post tension, meaning it's held tight by steel cables running through it, where the utility lines run, and whether your address needs a permit. Once I've seen the job, you get a written estimate that spells out what's included, so you're not guessing what the price covers.