The reason why prophase 1 takes so long is because the cell must go through homologous recombination and cell checks to ensure that crossovers are finished before entering metaphase 1.
Each primary spermatocyte that goes through meiosis develops into four sperm. During pregnancy, stem cells are implanted, and they are still there at delivery and the start of adolescence, but they remain dormant.
Male germ cells are created in the seminiferous tubules of the testes from a self-renewing stem cell pool throughout life, from adolescence to old age. Spermatogenesis refers to the entire process of developing germ cells.
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