Our first nanny was with our kids for over two years (since DS was 14 mo and DD was almost 3). They had a great, warm, loving relationship; nanny was energetic, artistic, really immersed herself in the role and within our family.
Sadly she has moved on to a new career. (Yay for her!)
We've just started with someone new last week and DS (now nearly 4) is really taking time to adjust. The new nanny has a very different style and personality -- much more reserved and tends to stand back more rather than dive in, from what I can tell. This is not necessarily a bad thing, it can be good for the kids to learn that people have different styles and personalities. I also recognise that it's an adjustment for me too. I miss our old nanny. But I want them to have a warm relationship and I'm not getting much of that vibe yet. DS is having trouble with the change; DD seems fine.
The new nanny has moved here from another country, where she worked in preschools for several years, so she has lots of experience. She understands English well but seems reluctant to speak it (we want her to speak her native language with the kids anyway, but to be able to clarify in English for them if necessary).
It's only been one week and she's part-time, so I guess it will just take a while to get used to the new arrangement, but I'm wondering how long people usually give for the nanny and child to form a bond and be comfortable with each other. And if it doesn't happen?