Also all day is a long time for him to be gone? Any advice on how to check our his ability to handle that ahead of time?
If a child is toilet trained and does not need a nap, then the only barrier to being gone all day which comes to mind is being "homesick". It seems this occurs when there is not support (which the child is used to finding at home), and the child needs to develop new skills and patterns of interacting in order to gain supportive interactions in the new environment. If the environment is conducive to understanding giftedness and building supportive individual relationships with children, as well as fostering supportive relationships among the children... sounds like it's a go.
