Updated Itinerary

2/8: Fly from Bangkok, Thailand to Colombo, Sri Lanka

2/9-2/11: Hikkaduwa, Sri Lanka

2/12-2/17: Agra (Taj Mahal), Jaipur, and New Delhi, India

2/17-2/21: Istanbul, Turkey

2/21-2/24: Cairo and Giza, Egypt

2/24-2/28: Tunis, Tunisia

2/28-3/2: Munich, Germany

3/2-3/4: Amsterdam, The Netherlands

3/4-3/7: Casablanca and Marrakech, Morocco

3/7-3/9: Lisbon, Portugal

3/9-3/16: Rio de Janeiro, Brazil

3/16-3/20: Buenos Aires, Argentina

3/20-3/22: Travel from Argentina to Santiago, Chile (by way of Mendoza)

3/22-3/31: Chile

4/1-4/2: Cuzco, Chile

4/2-4/7: Inca Trail to Macchu Pichu, Chile

4/8-4/10: Lima, Peru

4/10-4/18: Guatemala City, Guatemala

4/19-4/25: Tokyo and Kyoto, Japan

4/25-4/29: Seoul, Korea

4/29-5/3: Beijing, China

5/3-5/7: Ulan Bator, Mongolia

5/7-6/20: Southern Provinces of China to Lhasa, Tibet, and Annapurna Circuit trek near Kathmandu, Nepal

132 Days, or ~18 Weeks, 21 countries (22 if you include Tibet).