I have no idea how many litterboxes I'd have to put in, 3 per day I suppose.

I never let Filou and Tigris alone not even overnight -mostly because if Filou doesn't like the litterbox he looks for other places (he did not do that for 4 years now so I am very proud of my cleanliness but when we are here he asks us to clean it )

When we are in holidays, they get 2 visits per day and they get along very well - up to three weeks. For a longer time we had my parents come over. This is no longer possible as F+T don't accept my parents' dog -so we won't leave longer than 3 weeks.