Really? Thought it would take much longer than that. It is very light scratching, but it is on every verticle panel.
If you can feel the scratches with your nail then it will need wet sanding to level those out.
If it is really light scratching without a lip you can feel with your nail then you should be able to take them out with a DA machine. If your comfortable with a DA machine 2 to 3 stages on a GT takes around 16 hours to do the whole car.
Pick the panel that shows the most scratches. Wash the panel / car and then wipe down the panel with an APA.
Do a couple of passes with your DA machine with a mid pad and mid compounds and then buff of the residue. If the scratches have come out or your just left with very light scratches and swirls then just do the rest of the car with a mid level compound and then do a final polish with the light compound and soft pad.
If there are still some heavier scratches then do the panel again with a harder pad and heavier duty compound buff off and then do a pass with the mid compound again. If that clears everything but the lightest scratches and swirls then a final pass with the soft pad and light compound should bring it back up to the pre crow level. It will mean the rest of the car will need leveling to that panel so either 2 or 3 stages will be needed across the whole car depending on how many stages you needed to treat the first panel.
When your dealing with scratches makes sure you wipe down the panel with APA after buffing and before you start the next stage.
My indicated 1 hour time was assuming it is the passenger door that needs wet sanding and the rest of the car was ok after clean up.