Years ago I worked in an engineering department at a renewable energy center. The project manager urgently asked me for a development to transform a format from one system to another, it was for the next day, and at the last hour of the day. The next day he only asked me how the subject was, I told him that waiting That the analyst of the other company arrived, that I had finished it the same day. A year later, this project manager called me to see if I had the development in question that the requirements had changed and we had to update it, six months later when I met the other analyst ......this is Spain :o