This lasts around 25 days when i fill it properly, for my one cat.
No Odour until the final day, then you know it has to be changed. Great Stuff! Better than the Catsan Rubbish

It say's that it lasts up to one month - I only have a kitten, I bought a bag last Tuesday - today is the following tuesday, and I'm having to buy more in the morning. It looks clean and fresh when it has just been poured out, but after about two days it looks yellow and dirty. In the morning i'll be going back to Catsan.

This cat litter is the best I've tried. My cat doesn't leave a trail of litter behind her when she leaves the box, it lasts longer than other brands and it isn't dusty. I love it! (And so does my cat!)