I guess if I had a little more experience I'd know but I also think that I might tend to use more than an experienced guy just because I really don't have any experience. You might "know" that the wind is going upslope or what not but I'll probably check three times just to be sure. Then once more just to make certain.Just one! No way you could come close to using it up in such a short time. If you do you are being paranoid! (grin) I use mine mostly once I have elk located or I feel they are there in a certain spot, outside of that it would be a waste of time. Cover ground best you can with advantage wind & you'll do fine!