how long will a 20 pound bag a anti clumping litter last one adult female fixed cat?she is a big cat

Depends on how much you put in there and how often she goes. It could last you 2-3 weeks.

I have 4 cats, 2 litter boxes and go through 40 lbs about every 2 weeks. Our cats like it DEEP though.

its gonna depend on alot of things. how often you change your litter, how much she uses the box. ect.

oic thank you.she was useing hartz old fashoined stuff in orange bag but i am outa town a lot so i figured i beter go get something better.she was so happy to see me today i was gone 3 days

I'd say that one should scoop it at least twice/three times a day...and then dump it all out at least once a week? 20 lbs...should last a cat a few weeks...but probably less than a month. Every once-in-a-while, you should add a cup full or two to replace the amount that is lost when clumping to the cat's 'duty'...but it should last you at least two or three weeks.

Fr. Gregg

We use a 34lb bag every two weeks or so (but we completely empty the boxes every two weeks) with 4 cats and 3 litter boxes (using worlds' best cat littler which is a little longer lasting than regular litters)