DAILY, im not sure what works but i would use something with deets in it and try and avoid the swamps--due mostly to the west nile virus that is contacted through mosquitoe bites. not sure if you have the virus in your area though but i would be careful. they recomend deets for the insect repellant to rid off west nile virus. plus in some areas there is now the threat of malaria --also contacted through mosquito bites. good luck, annie.