As a Turkish citizen planning your adventure to Vietnam, you'll find the e-visa system offers a convenient path, allowing for a maximum stay of 30 days with two available tourist visa types. This electronic visa, costing around $25 USD, can be applied for online, streamlining your entry process significantly. Given the vast distance and distinct time zones, factoring in approximately 10-12 hours of flight time from Istanbul to Hanoi is crucial for planning your itinerary. Remember to familiarize yourself with Vietnamese Dong (VND) as you'll need it for local expenses once you arrive, particularly if your travel falls within the peak tourist season between September and April for pleasant weather.