How long does it take to walk 510km?

Answer 1

Average walking speed is between 4 and 6 km per hour. Assume a well-trained walker makes 5km per hour (less on incline). Assume eight hours walking per day: 8 hours * 5 km/hour = 40 km per day.

Note this is very ambitious, expecially when continued over 510km / 40 km/day = 13 days. I'd imagine covering a 510km distance should take 16 days at least, assuming no steep mountains en route.