We summarize the current view on Parton-Hadron duality
as it applies to $B$ meson decays. It is emphasized that an OPE
treatment is essential for properly formulating duality and its
limitations. Duality violations are unlikely to become the limiting
factor in describing semileptonic $B$ width vis-a-vie higher order
corrections. The consistent extraction of the $b$ quark mass from
$B$ production and decays provides a striking example of the
theoretical control achieved.