“Standard” leases: these have an initial term of one year and are renewable on a yearly basis thereafter, unless notice is given at least three months before the (annual) expiry date.
Multi-year leases: these often provide for a three-year term (never less); the rent for the initial period of the lease is fixed in advance. The rules for renewal and termination are usually the same as for standard, one-year leases.
Indexed leases: these have a term of at least five years, and the rent may be adjusted in accordance with the Swiss Consumer Price Index (ISPC) once a year. After an initial term of at least five years, such leases may be renewed for another five years every five years, or for one further year on a yearly basis (depending on the régie or real estate agency), unless notice is given at least three months before the (yearly or five-yearly) expiry date.
Fixed-term lease: often for a period of one year, but can be longer. There is no need to formally terminate the lease on the expiry date, as the end date is known from the start. It is possible to request an extension; however, that request may or may not be accepted by the lessor
Reminder: regardless of the type of lease, it is always possible to terminate a lease early by presenting a solvent buyer tenant; more information.