Why might different cells of the same organism have cell cycles of different durations?

Cell cycles:

The amount of time or the duration of time required to complete the development and maturation of the body cells. As the parent cells are present less in number and then through the process of cell division the cells divides and forms more like itself.

Explanation:

Duration of the cell cycle:

From the initial point to the last by means of the maturation of a single, there is a sequence or chain of phases through which the cell passes and they develop into a more complex form. But, some phases requires more time then the rest of the phases.

But, there is a difference in the duration of various phases during the development of cells of the same body, as they require time to complete certain tasks, as most of the time the focus is on the cell's proliferation rather then regulating the cell cycle. As different cell phases needs different duration's or timing to complete there growth.For example, during the different phases of the cell growth, there are various proteins involved and for that reason during each phase of the cell growth we analyze the dislocation of certain enzymes and protein. And obviously some of them needs to be produced first and then used by the cells so, it do takes some time to complete the whole process in general.