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I think it depends on the cats. if you have queens for instance or if you have a cat that is a bit shy or kittens or a busy house hold. I have a two story three bedroom house. one queen and one neutered female who is recovering from hip/pelvic surgery. I have two litter boxes upstairs, one at the end of the hall and one in the quiet guest room. I then have two downstairs, one under the stairs next to the tumble dryer and the other in a cubby behind the tv in the lounge. I would rather have more litter boxes then have wee in my house. I don't mind cleaning them and the litter I use doesn't smell and I clean mine every day.

i have two cats and one tray hav never needed any more !

My Queens are fussy ,they all have their own litter trays,they are cleaned morning and evening which has become a daily routine

I have 5 cats and 5 trays, i scoop them twice a day and empty and discinfect them weekly, ive not had any probs so far, touch wood (touching my head)

Well the 'officail' guidlines are as you have stated, one per cat and one extra, but it all depends on personal circumstances.

We have 4 cats/kittens, and one large tray in the bathroom. One of my kittens is too young to go out, so she uses the litter tray all the time. The other 3 of my cats free roam (well sumdge doesn't at the moment, because of his accident), so they generally go to the loo outdoors and only really use the tray at night.

I do have spares in case I need to leave an extra tray down.

I have 7 cats and once had 10 trays but only 5 ever got used. So they have 5 large ones all covered and in various locations. They seem to like this layout. If I have any more cats I would dig another tray out and see how it goes.

I scoop as soon as I see a solid in the tray and completely change the litter every 2/3 days and give them a proper clean etc.... sometime more often.

PS. Love the piccy of the cat's in the tray