Distance/Speed= Time So... 117,596,996,000,000/17,500mph= 671,982,842.9 hours Or... 27,999,285.1 days which is 76,710.37 Years. Or 7,671 decades. Or 761 Centuries Or 76 Millenia. By the time Gliese 581 is reached it will be the year 78717 f**k Warhammer 40k