For three or four days before I go into the jungle, or summers woods in the UK, I use it to wash. The day before I go out , I stop using it, because the smell is so alien in the wilderness, and would be picked up by humans and animals alike. From my experience it seems to last about five days.
This is not a medical, or scientific fact, so please remember its not guaranteed to work for you.
This weekend we have a course comming up, and ticsk ay be around, so I have been bathing in coal tar soap, by the way its not the most romantic of smells, and