I've been using mine pretty regularly and it appears like I've barely scratched it.. I'm swearing off buying any new soap (I hope) until I start using some of my products up.
I am 3/4 done with my third MWF. Rate of use depends on how one uses the puck. I presoak and dribble lather from my mug into a scuttle containing glycerin and a dollop of Bigelow cream. This means of lathering uses my puck up a lot more quickly than lathering on a dry puck directly from my mug using a pre-soaked brush. A puck still lasts for many weeks when using the scuttle.
I wonder how long it will take to use up my 1 kg brick of Cella?
Just started seeing the bottom of my 2nd puck, and trying to remind myself that I have to use up other stuff before ordering another MWF. I don't think I can keep that promise since its such a dependable product and great for winter moisturizing....even though I have Institute Karite and MdC in my rotation now. Ugh! A hobby I love to "hate' so much.