My experience is that teachers who reply usually ask about three or four questions, and some who don't answer well may temporarily add questions.

The time for reply is generally stipulated. If you answer fluently, the teacher usually shortens the time. If the answer is not fluent enough, it may take enough time to publish.

note:

1, be familiar with all the contents of the paper you have written, including details.

There are many ways for the defense teacher to ask questions. He can ask you to explain a noun, or where a sentence in a paper comes from, what do you think of a book or author mentioned in the paper, and so on.

2. Make in-depth preparations for some main points.

Some defense teachers are eccentric. When they ask questions that interest them, they like to ask endless questions. This kind of teacher is the most terrible.

The above is just a personal opinion. In different places, the procedure of defense may be very different.