This noun simply denotes a period of two years. Acts uses it twice to mark significant durations in Paul's ministry: Felix leaving Paul imprisoned for 'two years' before being succeeded (24:27), and Paul's 'two years' of rented house ministry in Rome (28:30). The term is straightforward chronological marking without symbolic overtones. Both instances involve extended periods of relative stability—Paul under house arrest or detention rather than active persecution. The two-year periods frame important phases of Paul's witness, though the Gospel continued advancing despite his confinement. Spanish 'dos años' and French 'deux ans' render this literally as the simple temporal designation it is.