California Codes, Civil Code - CIV, Division 2 — Property, Part 1 — Property in General, Title 2 — Ownership, Chapter 2 — Modifications of Ownership, Article 1 — Interests in Property, Section 691
A perpetual interest has a duration equal to that of the property.
Notes
Defines a perpetual interest as one whose duration equals that of the property itself. Provides that single measure of duration and nothing else, setting no rights, duties, deadlines, dollar amounts, or exceptions, and leaving limited interests to be defined in a separate provision.
Use as reference
Lexinter.net | California Code, Civil Code - CIV § 691 | https://laws.lexinter.net/codes/california/civil-code/division-2/part-1/title-2/chapter-2/article-1/section-691