Twelve months is the most common standard worldwide, but the full picture varies by country: some markets favor open-ended contracts that run until someone gives notice, others use fixed one or two-year terms, and six-month or even month-to-month arrangements exist mostly in furnished and flexible segments at a price premium. Ask what's standard locally, because proposing an unusual term can weaken your negotiating position.
Renewal mechanics matter as much as the initial term. The common patterns: automatic renewal for another fixed term unless either side gives notice by a deadline, conversion to a rolling month-to-month arrangement after the first term, or a fresh contract with a rent adjustment. Find out which applies, what notice the landlord must give you, and whether local law caps renewal rent increases, since many countries regulate that.
Early termination is where tenants get burned, so read that clause before signing.