The fumigant used for drywood termites is a very thin gas. It is supposed to penetrate deeply and be all gone before anyone considers re-entry. Perhaps some gas might remain for a while in things like the sponge-rubber of furniture but it will dissipate fairly quickly. I wouldn't worry about washing utensils but I'd probably go through his pantry and dump some food that worried me.

It is much easier to go in before the application and double-bag (Ziplocs or similar) anything that might be a concern.

Most species of termites have soldiers.  This is a special caste within the colony that takes on certain roles. Soldiers tend to have large heads.  It is very common for their mandibles to be greatly enlarged.

No.  In general termites prefer timber that is a bit soft, decayed or weathered but they will eat many types of hardwood (wood from trees with flowers not cones).  There are also many types of tree that produce timber which is generally termite resistant and quite a few of these trees are hardwoods.

Lets say you live in a known risk area for termites (count the advertisements in the telephone directory).  It is normal for an inspection to be recommended to be done not less than once a year.  Some people tend to stretch that out a bit.  If you do go for less-frequent inspections it will almost certainly impact on any insurance or warranty you may have covering the termite risks.  Read the contracts.

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 i

Orange oil is the name given to extracts from the peel of citrus.  Mostly this is near pure d-limonene.  It is a general solvent.  You have probably used it in bathroom or hand cleaners.  It kills insects.  I used it as the recommended cleanup solvent for the Blockaid non-toxic termite barrier as it was much less of an OH&S risk than mineral turpentine.