The maximum duration of a standard lease agreement in Ohio is one (1) year. Leases for longer periods can be valid, but they must comply with a few additional laws.
Leases of one year or longer must be in writing. Leases for 3 years or longer must be notarized in order to be valid. If not notarized, they are considered month-to-month tenancies instead.
Oral leases for terms shorter than one year are valid, but it is recommended to get all leases in writing. Oral lease agreements are difficult to prove, and the terms are not easily defined.
The information for this answer was found on our Ohio Residential Lease Agreement answers.