Typically a home inspection is done before the offer to purchase is finalized not after the fact. The ramifications of this is that the purchase price is altered depending on the outcome of the investigation or the sale is outrightly rejected. I would suggest that the potential buyer is buying time to find alternate financing. I would ask him straight up where he's at. I would hope you have a time limit on his ability to access financing. I might also suggest that you enroll the help of a real estate agent to organize the sale so that you aren't wasting time. The agent could charge you a lower percentage because much of the work is done. Depending on your current contract you might need the consent of the purchaser, you might entice him by mentioning that the agent has other financing options which they usually do. The agent would also have a sense of where the purchaser is at and how to move on if need be. The waste of time is to the purchasers benefit, if the house gains value in this slightly volatile market he wins by getting a bargain, if value decreases he wins by dumping the house back on you saying he is no longer interested. The market tends to increase in the spring and fall. Good luck.