The length of the road Alexander and the nobles determined was a total of around 800 km.
This number was achieved by Alexander first demanding three straight main roads built which extended 90 km in the north, east, and west directions from his city Zanzan, for a total of 270 km.
Then there were the various noble fiefdoms connecting with each other that demanded another 300 km of new roads
And lastly, the nobles were asked to repair and expand some of their existing roads for easier trading, for another 250 km of additional paved ground.
Once this was determined, and the route and specification selected, Alexander then invited an expert to help him estimate the time and cost.
And that was Diaogosis.
The man had been building roads for Alexander for three months now, and with his experience in building stone-concrete roads, Alexander could think of none better.