It matters what day it is, on a weekend, I'll go through 4-5 in a day, during the week probably more like 2 a day, one in the evening and one to sleep, I don't usually wear anything more than a guard during the day if I have to work, and I don't count that. So I'll go for an average of 3 a day, seems like I probably go through about 21 in a week so that sounds like a good average.