Normally, the approval letter is processed within two (2) business days (excluding Saturday, Sunday and National Holidays). In urgent cases, your visa request can be processed within 4-8 working hours (excluding weekends and weekday evenings).
Notes: all applications must be submitted before 8:00 AM Vietnam time to have it finished by noon time at the earliest and 5:00 PM by the latest. All applications submitted after 2:00 PM will be held until the following business day.