How long does it take light to cross the universe?

1 A.U.= 1.49597870 x (10 to the 11th power) metres. The speed of light = 299792458 metres / second. So t=1 A.U. divided by c = 499 seconds or 8 minutes, 19 seconds. An Astronomical Unit is a little less than the average distance between the sun and the earth.