The answer depends on whether you mean 15 degrees on a clock face (0.5 hours) or 15 degrees of longitude (1 hour).
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Neptune has an uneven rotation that varies between 12 to 18 hours. I will use 15 hours as a midpoint. Neptune has 360 degrees total. Divide that by 15 and you get 24 degrees per hour. Multiply 24 by 3 and you get 72 degrees. So, based on 15 hour rotation time, Neptune will spin 72 degrees in just 3 hours.
7.5 degrees per hour.
7.5 degrees per hour
On an ordinary clock, with 12 hours on the face, the hour hand rotates360 degrees in 12 hours30 degrees in 1 hour = 60 minutes1/2 degree per minute5 degrees in 10 minutes
131,490 hours.