Leave them in the salt until you can not bend the toes at all. If you can still move them then there is still moisture in them. Also you may want to change the salt once in a while.
A dehydrator will work well. Or use salt and borax. The salt will draw out the moisture and the borax will help keep bugs away. Depending on on you climate it can take a day to a week. You can also soak them in denatured alcohol for a few days to a week, then let dry. You can get it from...