Day school generally places many more demands on your time, so it may not be ideal if you have a busy career that makes it difficult for you to devote the necessary time to taking your children to places, cooking meals or supervising homework. Unless the school is within walking distance, you may have to drive your children to school and pick them up every day, to say nothing of extra-curricular activities, which may not take place at school. Day schools also tend to expect more parental involvement in things like Parent Teacher Associations, which you may not have time to take part in.