The Greek word “dietia”

Limited to Acts 24:27; 28:30Acts 24:27; 28:30
English: American Standard Version (1901) - ASV

27 But when two years were fulfilled, Felix was succeeded by Porcius Festus; and desiring to gain favor with the Jews, Felix left Paul in bonds. 30 And he abode two whole years in his own hired dwelling, and received all that went in unto him,

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and always applied to Paul’s waiting for “judgment,” the Greek noun “dietia” described a period of two years.  This word is not used prior to the Christian era.