3.18 Recommended Practice.— When issuing passports for tourism or business travel, Contracting States should
normally provide that such passports be valid for a period of at least five years, for an unlimited number of journeys and for
travel to all States and territories.
Note 1.— In consideration of the limited durability of documents and the changing appearance of the passport holder
over time, a validity period of not more than ten years is recommended.
Note 2.— Emergency, diplomatic, official and other special purpose passports could have a shorter validity period.