I have a very high probability of being fired in the next week or so. So I want to be prepared to know my options and need advise for the same. If fired, my intention is to get an extension for few months and look for new job and TN. As we are now given 60 day grace period, should I file I-539 during the end of 60 day period and then you get another 6 months or i have to file the I539 on the last day of the job. If its a all of a sudden termination at the end of the day, how can i file the I 539 on the same day? Also, approx how long it takes to get an approval for the i539? and while pending the status, can i change the status to TN again if i find a job. Please advise the best course of action in a time constraint and the longest possible extension.