FTL travel times calculation (A little help here, please?)

[StarSword]

I need a little help with my math. In this thread I was trying to calculate the travel time from Earth to Proxima Centauri (4.3 light years) for Samus Aran's ship, which according to the Metroid Prime website (via avatarxprime) has a top FTL speed of 72c.

What I tried was:
4.3 light-years x 365 days per year = 1569.5 light-days
1569.5 / 72 = 21.8 days' travel

Am I doing this right?

[fnord]

Well, a lower bound from t = s / v could be derived from neglecting the STL transit each end.

Per your data, Aran's ship travels at 72 c, so would require 1 year to travel 72 ly at full throttle.

4.3 ly is ~ 6% of the distance it could cover in a year, so it would take (assuming no material speed deviations en route) 6% of a year, or 0.06 * 365 days. That works out to 21.9 days (the exact figure is 5.97222...% of the full distance, giving 21.79 days, or just about your figure).

So yeah, you're doing it right.