Re: How long does it take for human bone to completely fossilize?

Mineralisation of Bone depends on the enviroment that it is deposited in 
and the relative thickness of the bone. This process can take up to a 
couple of years to thousands of years. In certain conditions, such as where the 
minerals in the surrounding enviroment are extremmly soluble, the process 
will be sped up - for instance, in some places in Australia fossils can be
created in a short period of time. Scientists in have now made Petrified wood 
in the lab
in a matter of hours.
Minerals in extremely soluble conditions will penetrate bone and other organic
matter extremely quickly in the right 
conditions.