I loved this shampoo bar so much (and I have used another well known brand shampoo bar) that when I ran out, and the pharmacy where I bought it no longer stocked it (silly people) and I no longer had the package with name, I had to hunt through pages of messages I had sent to my daughter, because I knew that about a year ago (it was 11 months ago) I had started using it and wanted to tell her how good it is compared with the other brand. So, that means my shampoo bar lasted 11 months. I wash my hair every 3-4 days, so that's very durable. It lathers easily, leaves my hair in perfect state - not too dry, not too oily - best of any shampoo I've used in years, and I keep it on a drainer in the shower above the main water flow. Mad if you don't use it!