How long can I stay in the United States if I20 is invalidated?

According to the law, there can be no gap between I20s. If you can't get it, you can't stay in America. However, considering the aftermath of transfer and study, the Immigration Bureau allows students to overstay in the United States as appropriate. There is no time limit, but generally two or three months is not a problem. After that, it is illegal to stay unless a new i20 follows. As the upstairs said, if you overstay for less than one year, you will be punished for not entering the United States for three years, and if you overstay for more than one year, you will be punished for not returning to the United States for ten years. It is suggested that the landlord wait for the next i20 after the last i20 and enter the country a little before the school starts. Because, even if you go to a new school and get i20, the new i20 hasn't started yet. Autumn classes usually start at the end of August and the beginning of September, and now it's only 1 month, eight months behind, which is too long to connect with the last one. Immigration will not consider any reason. My identity will be broken. Once the identity is broken, this situation cannot be bleached. So leaving the country is the only option.