Continuance means persistence, duration, or steadfast endurance. It may refer to the appointed course of one’s days or to patient perseverance.
The term is associated with the days ordained by God and with steadfastness in doing good. In older translations it may also represent long duration.
The Revised Version replaces “continuance” in the cited passages with “the days that were ordained,” “of long time,” or “steadfastness,” according to context.