First of all, the revision of doctoral thesis is a complicated and time-consuming process, which sometimes takes days or even weeks to complete. If you encounter some technical problems or need extra time to obtain experimental data during the modification process, the time may be longer.
Secondly, the revised paper needs to be submitted to the blind experts for review again. This process also takes a certain amount of time, and may require many revisions and submissions before it can be finally approved.
Therefore, if the doctoral thesis is revised for one month, the graduation time may be delayed. But the specific degree of influence depends on the specific regulations and requirements of the school or department where the doctoral students are located. Some schools or departments may extend the graduation period for doctoral students, but exceeding this period may have a negative impact on their studies and future.