Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Farming of Estates - Their Size
The Roman land-estates were, considered as larger holdings, uniformly of limited extent. That described by Cato had an area of 240 jugera; a very common measure was the so-called -centuria- of 200 -jugera-. Where the laborious culture of the vine was pursued, the unit of husbandry was made still less; Cato assumes in that case an area of 100 -jugera-. Any one who wished to invest more capital in farming did not enlarge his estate, but acquired several estates; accordingly the amount of 500 -jugera-,(2) fixed as the maximum which it was allowable to occupy, has been conceived to represent the contents of two or three estates.
2. II. III. Licinio-Sextian Laws
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Reference address : https://www.ellopos.net/elpenor/rome/3-12-management-land-capital.asp?pg=2