Job's friends insisted that the wicked always met a swift and terrible end. But Job pushes back, asking a pointed question about the fate of the ungodly. What does he mean by a 'lamp' going out?
Job uses the imagery of a "lamp" or "candle" to represent the prosperity and well-being of a person, especially the wicked. His friends, like Bildad, had painted a picture of constant, inevitable doom for the ungodly – their light being snuffed out. But Job challenges this view by asking, "How often is it that the lamp of the wicked is put out?"
He's not denying that bad things can happen to the wicked; he acknowledges it happens "often." However, he's questioning the certainty and frequency his friends claim. The implication is that it's not as constant or guaranteed as they suggest. Many wicked people seem to enjoy prolonged periods of success and stability, their "lamps" burning brightly for a long time.