Of course, such long routes for travellers and tradesmen would often take months on end, and during the reign of Darius the Great numerous royal outposts (Caravanserai) were built.
Bagi musafir dan pedagang, tentu jalur yang panjang tersebut memakan waktu berbulan-bulan dan diakhir kekuasaan Darius Agung dibangun beberapa pos jaga kerajaan (Caravanserai).