As long as it takes to wash and dry the litterbox and food and water dishes. FELV dies almost instantly outside the cat's body, once the virus dries, it dies. Bleach is not required to wash the litterbox or dishes, if they are dried well, that will kill any remaining virus that could be in them. If you wish to be extra careful, set them out in the sun for a few hours.
Phaewryn http://ucat.us/domesticcatlinks.html Special Needs Cat Resources
