I have 3 ferrets & 1 cat that share litter boxes, because of the ferrets I have 9 litter boxes around the house. The cat pretty much only uses 2 of them.
I scoop daily or every other day & empty every other day to every third day.
(it really depends on how smelly the cats feces are & how much out of cage time the ferrets have)

I really do not notice an odor (unless Meko got canned food LOL) I use the tidy cats, non clumping (cause of the ferrets) I use half & half of the immediate odor control & long lasting odor control. I also sprinkle wood pellet litter on the top (also for the ferrets).