So theres 366 days in a leap year, you need to find hours, minutes, and then seconds 366 x 24 = 8,784 hours 8,784 x 60 = 527,040 minutes 527,040 x 60 = 31,622,400 seconds 31,622,400 seconds x 186,182 mps = 5.88 x 10^10 therefore light travels 5.88 x 10^10 in one leap year