Initially one has to completely fill up the application with correct infos provided in the passport.
After completing the application one has to clear all the custodies. Within two working days after submitting one will obtain conformation mail which is needed to print along with 2 passport photos with stamping fees.
At airport you essential need to wait till your call for visa seal is done with filled-up form, your passport and photographs,.
Maximum validity time of the tourist visa is 3 months and of the business visa is 12 months. Thus we advise to go for it as soon as you reach Vietnam.