A human skin fibroblast growing in culture was shown to divide every 32 hours. Microscopic observation indica?

A human skin fibroblast growing in culture was shown to divide every 32 hours. Microscopic observation indicated that 3.3% of the cells are in mitosis at any given time. Analysis in the flow cytometer established that 51.3% of the cells had DNA contents of 2n, 15.7% had DNA contents of 4n and 30% had DNA contents ranging between 2n and 4n. What are the estimated lengths of the G1, S, G2 and M phases of the cell cycle of these skin fibroblasts?