I suggest that if you have the choice, you can take an interview course for nine days and eight nights. After all, you can be more sure after a long time. Of course, you can take six days and five nights off if you don't have time. The interview course is mainly about learning etiquette norms and course manuscripts. The difference between six days and five nights and nine days and eight nights is that the course manuscript is more detailed and the etiquette norms are the same. If you are proficient in explaining the course knowledge, six days and five nights are more suitable for you, but you still need to practice and revise it deliberately.