Usually, the doctoral thesis needs to be revised several times, at least three times. The first revision usually takes one to three months, the second revision usually takes two to four weeks, and the third revision takes longer, which may take months or even more than a year. In some cases, the tutor may relax the requirements and only need to make minor changes or not, depending on the requirements of the tutor and the complexity of the paper.
Therefore, if you encounter difficulties or delays in revising your doctoral thesis, don't be too worried or anxious. You can communicate with your tutor and solve the problem as soon as possible. At the same time, waiting patiently for the improvement of your knowledge and skills in the research field will help you better understand and analyze your data and draw more accurate conclusions.