If you assume a life expectancy of 85 years, his sentence comes to 4,338 years. That means that an Egyptian guy who did this in the year 2323 BC would be packing up his stuff to return to society now.
2323 BC was the last year of the 5th Dynasty in Egypt, so it's a feasible scenario if it was chaotic. In case you're curious, Unas was the pharoah then:
http://www.ancient-egypt.org/history...nas/index.html. If you're wondering, the pyramids at Giza had been around for about 250 years, so the crime wouldn't have been related to them.