Butter will keep for a long time refrigerated. Up to 6 weeks. You can also freeze this product and it will keep for over a year.   Hi - I only accessed this question as I hâ¦ave just tried some butter I had in the fridge. It is now Sunday 14th June 2009.
Sperm can be stored inside the male body for approximately 3 weeks after they've matured, after which they die inside the body if not ejaculated. So the entire sperm life cycle inside a man's body if not ejaculated (10 week maturation time + 3 week storage lifespan) is approximately 13 weeks or about 3 months.
Sperm cells have their own guardians, the Sertoli cells, also known as nurse cells, which help protect and nourish the sperm until they're mature. These are the cells that respond to FSH. There is one nurse cell for roughly every 150 sperm. It takes 2-3 months (about 74 days) for sperm to mature. Mature sperm gather in the center of the tubules, while the immature sperm remain on the outer edges of the tubules. The nurse cells continuously sweep sperm into the center as they mature. When the sperm mature, they leave the tubules and enter the epididymis, a coiled, tubular organ attached to the testes.