Planaria can regenerate within a couple of weeks. The exact time can vary depending on factors such as the size of the planaria, the extent of the injury, and the environmental conditions. Generally, smaller injuries will heal faster.
48 hours
It will take about 3 to 6 months for fingernails to regenerate or regrow completely. The growth rate will depend on the age of the person.
1 month
1 hour
1.5 weeks.
A day
Actually its takes a matter of seconds to produce a sperm. Millions of sperm are produced in a day.
It takes about 74 days for the male body to produce sperm.
As unfortunate as this may sound, nerves do not heal. Nor do they regenerate. If you've suffered an injury that's caused nerve damage, that damage will not heal or regenerate.
It takes about 74 days for a sperm to fully develop in the human body.
So the eggs and sperm can move faster outside