Elevation: Up to around 5,000 meters (18,044 feet). Trail Description: Varied terr,ain with gradual to steep sections, well-marked trails, and teahouses along the way. Duration: Longer treks requiring 4-6 hours of trekking per day. Fitness Requirement: Requires good fitness and stamina. Acclimatization: 1-2 days of acclimatization is recommended. Examples: Langtang Valley Trek, Helambu Trek, Manaslu Circuit Trek, etc.