A typical liquid based termite treatments are known to last anywhere between 2-7 years. That's a broad spectrum of range, but just like everything else in the world, the effective period of a termite treatment can vary. For example, if termiticide is applied by a untrained person with no experience, there's a great chance that termite control is based on luck. Also environmental conditions and pH content of the soil can affect the longevity of the termite treatments.
Popular termiticides such as Termidor will last up to 7 years with 100% effective impact. Other termiticides like Dominion brand will last 7 years as well. Some other products can last anywhere between 2 - 7 years. But if you have termite treatment done by a pest control company, they will usually tell you in advance what kind of termiticide they use. If they don't tell you, ask them.
So I think I can say safely a typical liquid based termite treatments can last 5-7 years with full effect.
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anybody that can buy termidor (and i have seen it advertized on the web)and can read english can apply this product at least as good as any pro—The label is the law for treating so—not rocket science–
I have to disagree with you on this Dennis. Although you can purchase Termidor from online (although prohibited sales in some states), I’d rather have a trained professional to inspect the house and take care of the application of Termidor.