Your clients want a thorough inspection and you can be sure that is what they will get. I only do one inspection per day and my average time on site is 5 hours. This should not scare you, but make you feel confidant that you made a great referral to your client.
The best thing I can do for you is to walk you and your client through the home at the end of the inspection. This way you both can know what to expect on the report, what is normal wear and tear, and what if anything needs to be looked at further. By explaining the items that will be on the report, the buyer can understand what is significant and what is not, and then move forward with the deal.