28 days, just went and bought a couple of cow calls and a bugle. The E.L.K. foundation bugle can't be beat! I also bought a kit for scent control. Detergent, soap, spray,..ect, and then we also bought this lotion stuff for your skin and hair? There was a guy doing a elk seminar, and he continuously praised it as his fav. means of scent control. So we got two bottles to try out.