In South Carolina as in most states, the "Offer to Purchase" gives the buyer the right to conduct home inspections, termite inspections, etc. This is a time for the buyers to have total access to the property to determine its condition.

Most buyers hire a professional Home Inspector. Professional Home Inspectors are knowledgeable, experienced, and thorough. These inspections take 3 - 4 hours to conduct and in the course of the inspection they will go into the attic, crawl under the house, run the appliances, open every door, turn on every faucet, etc.

The point I'm trying to make is that they were hired by the buyers to inspect the property. As a seller you agreed to this condition. Therefore, you should give them the time and space they need to do what they need to do.