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That sounds okay, since you put the whole 40 pound box in there. I use a 40 pound box every month too, but I do it a little different because my litterbox won't hold the whole 40 pound box at once. So I fill it about half-way, then add about an 8oz cup of litter everyday after I scoop. Then after a month, the 40 pound box is gone and I dump and scrub with dish soap, and put all new litter.