Which is the longest phase of the cell cycle?

Cell cycle is divided into 2 phases. (i) Interphase (a period of preparation for cell division), (ii) M phase (the actual period of cell division). The interphase cell is metabolically quite active. Interphase is the long nondividing phase further divided into $G_1, S$ and $\mathrm{G}_2$. It occupies 75 to $95 \%$ of entire cell division time.