I can't believe I'm asking another cat pee question.
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We have a new "foster" cat, a two-year-old male. One of our 10-year-old female cats is timid by nature, and she's scared of him. I think she's been on the kitchen chair "hiding" almost all day.

She's been walking around some, because she ate...but I don't remember seeing her in the litter box. At night, the "old" cats go in their room with the door shut, where they have food, water and litter, of course. So she has a "safe" place for maybe ten hours.

I'm assuming that eventually (I hope soon) she won't be as uneasy (read: terrified) of the newcomer, but in the meantime, is it harmful for her to go long periods without urinating? I never really paid attention to how often they used the litter box. Nor do I know how often a healthy cat goes.
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