Well, we probably will have her stay with the inlaws. If we go in March she will be almost 6 mos., if we go in June she'll be 8 mos.
Curious as to what everyone thinks of this- how old should your cat be to left alone with a cat sitter coming in once a day? A year old? Less or more?
I think it depends on a lot of factors.
If there's another cat in the house, younger would be easier.
If it's just the one, still depends - on the kitty's temperment, for one. A more aloof cat I'd think would be better with that sooner than a follow-you-around-meowing type of cat who likes to be with her people all the time and talk and climb on them and be petted and is just really social.
Household routine would also be a big factor. If it's a one- or two-person, fairly quiet house where people are at work during the day and then come home, the cat is already alone a chunk of hours and knows people go for some time and then come back and they're used to amusing themselves and living in a quieter house.
If it's a house with more people, or younger kids, or where people are home more hours, be harder and more confusing and upsetting if people all suddenly disappear when before everyone disappearing was rare and then only for bits of time, and if before it's all lively and they're rarely alone and then suddenly there's nothing.
In the latter cases, I'd wait til past a year, I think, for that, maybe year and a half - depend on the kitten and how social and playful and how much attention she needs, how eager she is to see people when they come home vs. she can't be bothered to come to the door and is like 'oh, you're here?' when you pass by.