Many thosands of years - unless it is crushed. It reverts to sand.
no
forever.....
50 years!!!!
it takes 20 years approximetly to break down.
1 miller second
Years apparently
3 years
15.5 seconds
4 minutes
The water will not ever break down. You will need to remove it.
It takes 500 years to brake down.
it wont decompose if thats what your asking it would take hundreds of years for it to break down