I'm trying to think......I believe mine has been going around 3 1/2 months. And, to top it off, I didn't realize until about a week ago that I was supposed to load the brush in the tub. I had been scooping a little bit out and putting it in a bowl to lather. Because of that, I have been wasting a lot. I just ordered RazoRock XXX from Bullgoose and I will actually do it right this time!