Probably one of my favorite place for trekkingPhysically this trek is not so hard (ok, sometimes, because of the altitude, you gonna suffering a little bit ;) ), and must of the time you can choose between a trekking way (more interesting) and a dusty road (more easy).For the total circuit, you need more or less 20 days (including 2 days of rest), but you can also use jeep service (shared with other trekker to be cheaper) to reduce the trek to 6 days.