How long does it take for a kitten to adapt to a new environment?
After a cat moves to a new environment, it needs about a week to adapt. During this time, it will become very sensitive and will hide in a corner, afraid to come out. 
When a cat is adjusting to its new environment, it's best not to forcibly take it out, as this could cause severe stress. It's better to keep the environment quiet and let it rest for a few days; it should be fine then.
At this time, the new cat owner needs to stay with the kitten. The kitten will feel uncomfortable and insecure in the new environment. The cat owner can pet the kitten and use toys to distract the kitten.
Initially, the kitten may not eat, but the owner still needs to feed it and provide it with drinking water to prevent dehydration. After a while, the kitten will start eating.