If you are boarding a cat for a week, the answer is short. The nightly rate is the same as it is for two nights or for two months. Changes to the booking are complimentary up to 48 hours before check-in. And the same care team is with your cat every day of that week.
Most cat boarders are built for the long weekend. A long stay is a different problem: three weeks of renovation, two months of relocation, the in-between of a house move. The cat doesn't "adjust" the way a holiday rental promises. They just live there, and how they live shapes how they come home to you.
We've kept guests from 14 nights to over six months. The cats that do well long-stay are the ones whose routine doesn't break: same suite, same handler, same feeding rhythm, same window, same view. We build for that on day one of the booking, not week three.