If it is 587 quadrillion miles across our galaxy and you are traveling at 93,000 miles per second, how long will it take you to go across it?

(58.7 * 10^16)/(9.3 * 10^4) = ? seconds

To convert to hours, multiply by 360. For days, multiply again by 24. For years, multiply again by 365. for centuries, multiply again by 100.