The length of your trip to Vietnam really depends on what you want to see and do. If you want a taste of the country's main highlights, a week or two would be enough time to visit cities like Hanoi and Ho Chi Minh City, as well as popular tourist destinations such as Halong Bay and Hoi An. But if you want to truly immerse yourself in Vietnam's diverse culture and landscapes, a longer trip of three weeks or more would be ideal. This way, you can also include side trips to places like the Mekong Delta or Sapa mountain region.