  A "time"-covariant Schr\"{o}dinger equation is defined for the minisuperspace
model of the Reissner-Nordstr\"{o}m (RN) black hole, as a "hybrid" between the
"intrinsic time" Schr\"{o}dinger and Wheeler-DeWitt(WDW) equations. To do so, a
reduced, regular and "time(r)"-dependent Hamiltonian density was constructed,
without "breaking" the re-parametrization covariance $r\rightarrow
f(\tilde{r})$. As a result, evolution of states with respect to the parameter
$r$ and probabilistic interpretation of the resulting quantum description is
possible, while quantum schemes for different gauge choices are equivalent by
construction. The solutions are found for a Dirac's delta and a Gaussian
initial states. A geometrical interpretation of the wavefunctions is presented
via Bohm analysis. Alongside, a criterion is presented to adjudicate which,
between two singular spacetimes is "more" or "less" singular. Two ways to
adjudicate about the existence of singularities are compared (vanishing of the
probability density at the classical singularity and semi-classical spacetime
singularity). Finally, an equivalence of the reduced equations with these of a
3D electromagnetic pp-wave spacetime is revealed.
