1. Passport: Your passport should be valid for at least six months beyond your intended stay in Nepal. It should also have at least one blank visa page.
2. Visa Application Form: Complete the visa application form accurately and legibly.
3. Passport-sized Photographs: Attach recent passport-sized photographs with a white background. The specific size and quantity may vary, so check the requirements specified by the embassy or consulate.
4. Flight Itinerary: Provide a copy of your confirmed round-trip flight tickets or itinerary showing your entry and exit dates from Nepal.
5. Accommodation Details: Include a copy of your hotel reservation or an invitation letter if you are staying with a friend or family member in Nepal. This helps establish your accommodation arrangements during your visit.
6. Financial Proof: Submit evidence of sufficient funds to cover your expenses during your stay in Nepal. This can include bank statements, traveler’s cheques, or a sponsorship letter if someone else is funding your trip.
7. Travel Insurance: It is advisable to have travel insurance that covers medical expenses, emergency evacuation, and other unforeseen circumstances during your travel period. Provide a copy of your insurance policy.
8. Additional Documents: Depending on your circumstances, you may need to provide additional documents such as a letter of employment, proof of business activities, or a letter explaining the purpose of your visit.
9. Self-Addressed Prepaid Envelope (if applicable): If you are applying by mail, include a self-addressed prepaid envelope for the return of your passport and visa.

Tourist visas for Nepal typically allow a stay of 15, 30, 60, or 90 days, depending on the visa type and your preference. You can select the desired duration when applying for the visa.

The processing time for a tourist visa to Nepal can vary. It may take anywhere from a few days to a couple of weeks, depending on the embassy or consulate and the volume of visa applications they receive.