It's been a while since I took a physics course, but: t' = t * (1-v^2/c^2)^(1/2) t' = 9.5 * (1-16000^2/299792458^2)^(1/2) t' = 9.5 * 0.99999999857... (t-t')

It's been a while since I took a physics course, but: t' = t * (1-v^2/c^2)^(1/2) t' = 9.5 * (1-16000^2/299792458^2)^(1/2) t' = 9.5 * 0.99999999857... (t-t') years = 426.7 milliseconds