how often does spermatogeneis—the production of sperm—occur
Spermatogenesis For humans, the entire process of spermatogenesis is variously estimated as taking 74 days[5][6] (according to tritium-labelled biopsies) and approximately 120 days[7] (according to DNA clock measurements). Including the transport on ductal system, it takes 3 months. Testes produce 200 to 300 million spermatozoa daily.[8] However, only about half or 100 million of these become viable sperm.[9]