The agent's goal at this point is to allow the inspection to take place without upsetting the seller. I MUST look in closets, open some cupboards, climb into the attic, et cetera. In all likelihood, the inspection will reveal some aspects of the property that aren't flattering. These revelations MUST be discussed with the buyer. No matter how tactful an inspector may be, there are some homeowners who will be incensed by these discussions.
Inspections take time.
I am rarely alone, however. I encourage my clients to accompany me on the inspection and I also encourage them to ask questions during the process. Two and a half hours is about average, and if the home is very large, very old, or has had a number of modifications, more time is necessary. In most cases, the agent can discuss these aspects of the inspection with the seller ahead of time, and thus greatly minimize the stress. In other cases it may be best to arrange for the seller to be absent.