Warp speed is the way starship speed is measured in Star Trek. It is a logarithmic scale, not linear. Warp 10 is infinite speed, and is the same thing as occupying every point in the universe simultaneously. Here is a chart that shows how fast each warp factor is, compared to the speed of light, and the distance to our nearest star, Alpha Centauri, which is 4.6 light years distant.
Warp Lightspeed Time to Centauri
1 1 5 years
2 10 6 months
3 39 2 months
4 102 18 days
5 214 9 days
6 392 5 days
7 656 3 days
8 1024 2 days
9 1516 1 day
9.2 1649 1 day
9.6 1909 23 hours
9.9 3053 14 hours
9.99 7912 6 hours
9.9999 199516 13 minutes
The numbers above have been rounded, and are based on the Star Trek Encyclopedia's data.
