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).