Undoubtedly, it takes time to modify the content of articles submitted by sci. As for the length of time, the periodical will give the time limit range according to the difficulty of modifying the content. For example, minor repairs usually take about 10- 15 days, and major repairs take about 20-30 days. If you do supplementary experiments, the time will be longer. Different authors are not competent enough, and the time to complete the revision is different. Compared with the specified time, it may be ahead of time, just in time or delayed. If the revision is not completed within the prescribed time limit, the author can make it up in advance. Sci submission needs to be revised, indicating that some contents in the article need to be revised to meet the employment standards of this journal. However, it doesn't mean that you are hired. You need to take the time to review it again. As for how long it will take to get the result after the sci paper is repaired, it depends on the actual situation, and the result may be rejected. Therefore, the author should take every revision seriously, and read it through after the corresponding content is revised to ensure that there is no omission in the revised content. At the same time, in order to avoid the author's habitual mistakes, I didn't realize it, so I asked others to read it and put forward suggestions for revision before repairing it. If the modified content is enough, it can be repaired in advance without waiting for the specified time to arrive. In short, sci submissions can be revised in advance, but this revision is based on revision, rather than blindly pursuing speed and ignoring the quality of revision, otherwise the probability of rejection will increase. In addition, it is not too early to repair in advance, which is easy to leave a perfunctory attitude.