Strange question...
A vasectomy is permanently, unless you reverse it or an spontaneous re-canalisation occurs. A re-canalisation happens very rarely and mostly in the first years and a reversal is not so easy and it is not sure you become fertile again.
But be careful because you are not immediately sterile after the surgery: you need about a twenty ejaculations before you give a sample to verify if you are "clean".
If there is no sperm anymore in your semen you are permanently sterile.
If installed properly over 2,300 years
7 years.
Because coal is the most abundant fossil fuel in the world, a coal power plant can last for many, many years to come. It is also a cheaper fuel, which makes it more reliable than petroleum or natural gas.
toothpaste
me
Although it's rare for a vasectomy to "reverse" on its own, it has happened.
10 to 15 lbs max i just got a vasectomy
no, unless vasectomy was reversed at some point (an OR nurse)
Vastectomies can be reversed, but it isn't 100% effective.
the Leo last around 2165 years.
There have been six leap years in the last 25.
They easily last 30 to 40 years, if not longer.
i think it last 5-10 years
4 years
70 in the last 15 years
5 years
10 years!