OHP Decathlon 20 WP is only labeled for use in nurseries and greenhouses and is not labeled to treat for bed bugs. We normally recommend treating with one of our bed bug kits to ensure that you will have all of the products necessary for a complete treatment, as well as the necessary follow-up treatments. Which kit you choose will depend on the number of rooms that need to be treated. Please take a look at our article on How To Get Rid Of Bed Bugs for more information.
Since OHP Decathlon 20 WP contains Cyfluthrin, you should get residual control for at least 30 days for listed uses. The product label does allow you to retreat for active pest infestations as needed, but you should be cautious of possible phytotoxicity if the product is applied too heavily to sensitive plants.
Per the manufacturer OHP Decathlon 20 WP has a residual of about 30 days.