An estate for a determined period of time is an estate for years.
D.C. Code § 42-518
Estates for years
Mar. 3, 1901, 31 Stat. 1352, ch. 854, § 1032
Official source: D.C. Law Library (Council of the District of Columbia). Reproduced from public-domain District of Columbia statutes; confirm against the official source for the current text. Not legal advice.