Actually it's a trick question. At the speed of light, you would experience no time lapse at all, but everyone back at home would think it took 9 years(ish). Since you have to slow down, stop and turn round, that's the only time you'd experience time, and the question didn't give any clues about that part.
So if 8 hours for reversing is reasonable, mALX could be right (subjectively).
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Mods for The Elder Scrolls single-player games, and I play ESO.
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