According to Wikipedia, there is no such planet.
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Neptune has a rotation period of 16 hours 6 mins 36 secs.
960 minutes = 16 hours
52.5 hours/16 = 3.28125 hours = 3 hours 16.875 minutes - 3 hours 16 minutes 52.5 seconds.
9 hours and 16 minutes.
It is: 5 hours and 16 minutes