What is the ruling on contracts of indefinite duration, and what are the implications of having concluded such a contract 25 years ago?

For the validity of a lease contract, the usufruct must be known, and this is achieved by knowing the duration of the lease. Jurists have differed regarding the determination of this period; some have permitted it no matter how long it is, while others have restricted it to the lifespan of the asset. A contract that lacks a specified duration must be annulled and re-established with a defined period.