More than 2,000,000 (2 million) erythrocytes or red blood cells (RBCs) are produced in human adults each second!
Erythropoiesis is the process by which new RBCs are produced; evolving or maturing from a stem cell in nearly 7 days.
They develop in the bone marrow and stay active for 100 to 120 days in the adult body
Approximately,
Take into account that our liver is the main organ of RBC removal and iron recycling.