My female cat seems healthy. She is indoor and outdoor cat but when I come home at 6, she is indoor only until like 8 the next morning. She prefers to sleep in the garage because of her pesky son dominating her all the time. There is a litter box in there and I would say she used it 5 times in a year. That is over 12 hours without peeing. I think she goes sometimes in the in house litter box when she does sleep overnight in the house (her choice). So I took some of that litter and put it in the box in the garage. Nothing... Do I need to worry that she is holding it for so long.