Re: it's already doing 17.46 km/hour
17.46kps really isn't that fast when compared to light speed at 300,000kps, so any time dilation can safely be ignored. The dilation only becomes meaningful when you get up to higher fractions of light speed.
According to Relativity time will slow down even when you just walk to the corner store. Its all about how fast your moving relative to another point of reference.