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What is quiescent stage?when does it happen?

The cells that have stopped dividing temporarily or reversibly are said to be in the state of quiescence called G₀ phase. Progression from phase to another depends on the proper completion of the previous one. After the process of cell division, the daughter cells begin the interphase of the new cycle. The stages of interphase are not morphologically distinguishable, yet each phase has a distinct biochemical process that prepares the cell for initiation of cell division.

G₀ Phase

Sometimes the cells in the quiescent and senescent cells are referred to as post mitotic. The cells which are indivisible in  multicellular eukaryotes generally enter the quiescent G₀ state from G_1. They may remain in the quiescent state for long periods of time. This state can be for indefinite like in neurons and is very common in cells that are fully differentiated. Death of the cells in response to damage of DNA or degradation would make the progeny of the cells nonviable. Some cells like the cells of liver and kidney enter the G₀ phase semi-permanently.