For the Hebrews, time was duration: it went on for a certain measurable length, short (1 Sam. 9: 16), or longer (Eccles. 3: 1), or indefinite (Mic. 4: 7).

In the NT the Greek chronos is used for a length of time (John 7: 33) and kairos for an opportune time or moment of decision (John 7: 8). A third word, aion, broadly indicates an era and is used to make the distinction between ‘this present era’ or ‘age’ and ‘the coming era’, as in Eph. 1: 21.