How long should a termite inspection take?

This will depend on the size and complexity of the structure, the location and the type of inspection required.  Say you are getting a typical house checked out before you buy it.  I would normally expect that to take around two to three hours for the pre-purchase inspection.  Obviously, an old or heavily renovated house will take more effort than a brand new one.  If you have a contracted service or have a barrier system installed (subterreanean termites), then the regular inspection can be a lot faster, maybe even 45 minutes to one hour.  If you have reported an infestation and the technician is exploring the extent of activity using a range of tools (such as a Termatrac or thermal camera), then it may take the best part of a day.  Big houses take longer, apartments take less time.  Don't worry if the technician takes longer than expected as this is usually OK.  If you think the process was too quick, query about why and be sure to ask detailed questions about which areas weren't inspected (often because of blocking furniture or locked access).