Time taken for spermatogenesis is :

The process whereby the germ cells is conveed into spermatids is called male gametogenesis or spermatogenesis. Sholy before pubey, 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 sta the process of spermatogenesis (refer pg 47 Sheila Balakrishnan 2 nd edition)