When painting, the whole door should be painted to avoid color difference, so the area is relatively large.
24 hours if the weather is fine, and then you can't wash the car for three or four days. Because your car doesn't seem to need sheet metal. If it's winter in the north, it's best to go to the spray booth.
If there is insurance, keep the site and let the insurance company pay for it. I guess you are afraid to tell the master, aren't you?