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Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

Doc Brown has got a time machine, why is he in a hurry in the end of Back to the Future part 1? Why doesn't he just give a parenting lesson to Marty? A little more context: At the very end of part one, doc goes back to Marty to tell him about his son which is going to jail in the future and they need to stop that to happen. He is really in a hurry, but c'mon, you can wait a couple of days in the present then go back to the future at the very same moment he intended to go in first instance. He has plenty of time to achieve that!
Output:
Why is Doc Brown in a hurry in the end of Back to the Future part 1?