A bit late than never, but here is the unconverted version of my story:
“Dad, I’m going to miss you! How long will you be gone?”
“I’m going be the first human to travel right across the galaxy. That’s 100,000 light years!
“587,862,537,318,300,000 miles! And travelling like a car at 70 mph it would take 8,398,036,247,404,285 hours – that’s 349,918,176,975,178 or 958,679,936,918 years!”
“Dad, you can’t be gone that long!”
“Well using the new Quantum Slice drive you take the light years and divide them by the detonation capacity, which is 0.0085.“
“Ummm, 75?”
“No Billy, not this time.”
and, of course, congratulations to Tywin