The maximum duration of a standard residential lease in Maryland is one (1) year. Leases with a duration of longer than one year are valid, but they must be in writing (MD Real Prop Code § 5-102).
Verbal leases are valid for periods of less than one year (MD Real Prop Code § 5-101). However, it is recommended that all lease agreements be in writing, as it is easier to prove and enforce written leases.
In fact, if a landlord owns more than five units or properties in the state of Maryland, they are required to use written leases regardless of tenancy duration. If the landlord fails to provide a written lease, the term is assumed to be one (1) year (MD Real Prop Code § 8-208).
The information for this answer was found on our Maryland Residential Lease Agreement answers.