How Fast Did the Crew in Vaster Than Empires and More Slow Travel?

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The crew in "Vaster Than Empires and More Slow" travels for 10 hours and 29 minutes, which equates to 256 years on Earth. Assuming no faster-than-light (FTL) travel, the calculated speed approaches 99.999999999% of the speed of light due to significant time dilation effects. This conclusion is derived from the principles of relativity, specifically using the formula for time dilation. If FTL travel were involved, the speed could be calculated using the basic formula of speed equals distance divided by time.

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At the beginning of the story it is said the crew travels in space for 10 hours and 29 minutes, or 256 years on Earth. i was wondering if there was a way to figure out how fast/far they traveled?
 
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Welcome to the forums. Assuming there is no FTL in this story the distance will be just under 256 years. Given that the faster an object travels the greater time dilation it experiences using http://www.emc2-explained.info/Time-Dilation-Worked-Examples/bigeq.gif I get an answer of 99.999999999% of the speed of light.

If this was by FTL then simple speed = distance/time will give you an answer.
 
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