About seven working days. On the premise of having a complete manuscript, it usually takes about 7 working days for Chongqing University Electronic Audio-visual Publishing House to declare the topic and 20 working days for revision. The application number is about 1 month. In this way, it will take about 2-3 months to declare the title to the book number. If there is no complete manuscript, it will take some time to write a complete manuscript after the declaration of the selected topic is passed, so the required time cannot be determined.