Having as many as 6 cats in his house at one time and as few as 3 during his old age, my dad had a lot of litter boxes to clean out. Because he wasn't very steady on his feet when he was in his later 80s, he didn't take the poop out every day, but did clean the litter boxes each day putting the droppings into the long plastic bags that the newspaper came in. These he placed in a can and it worked good! Each week he would collect them to take them out for the garbage pickup.
Blackie, Timi, Striper
Sweet Thing, Sylvester, Softie