As cells live and die they move through steps in a process which is known as the cell cycle. A cells life consists of a period of growth in which DNA will be replicated, followed by the cells division into two daughter cells. The first is called interphase which includes G₁ phase, S Phase, and G₂ while, the second phase is called mitotic or M phase, which includes Mitosis and cytokinesis. Once a new daughter cell has been formed it immediately enters G₁ phase, in this phase the cell grows larger and organizes it organelles for later stages. In the second stage called S phase, the cell forms a new copy of its genetic material and its centrosome. Finally, the cell enters G₂ phase, the cell continues to grow, forming proteins and organelles until it enters mitosis. Once these 3 phases, collectively known as interphase, are completed the cell enters mitosis or M phase. When mitosis begins the DNA within the nucleus condenses into chromosomes and is pulled apart into two individual sets on opposite sides of the cell. This process is divided into known as prophase, metaphase, anaphase, and telophase. The final step is cytokinesis, this is where the cytoplasm of the cell is split into two and the two daughter cells have been fully formed ready to begin the cycle again. Different cells replicate at different rates, some cells will never replicate. Cells that don’t replicate frequently will spend a variating amount of time performing their function before entering G₁ phase, this period of time is known as G₀ phase. With this being said, a cell cycle can range from 9 hours to up to 24 hours, each different type of cell spends an appropriate amount of time in each phase.

References:

https://www.khanacademy.org/science/biology/cellular-molecular-biology/mitosis/a/cell-cycle-phases