Time taken for spermatogenesis is

The process whereby the germ cells is converted into spermatids is called male gametogenesis or spermatogenesis. Shortly before puberty, the testicular cords become canalized and form the seminiferous tubules. Accompanying this change is the conversion of the germ cells into a group of spermatogonial cells. At regular intervals, spermatogonia arise from this stem cell cluster to start the process of spermatogenesis