  The conversion of neutron star to strange star is argued to be a two step
process. The first process involves the deconfinement of nuclear to two-flavour
quark matter. The GR results shows that the propagating front breaks up into
fragments which propagate with different velocities along different directions.
The time taken for this conversion to happen is of the order of few $ms$. This
calculation indicates the inadequacy of non-relativistic (NR) or even Special
Relativistic (SR) treatments for these cases.
