  We report a high-resolution angle-resolved study of photoemission linewidths
observed for Ag(110). A careful data analysis yields k$-resolved upper limits
for the inverse inelastic lifetimes of $d$-holes at the X-point of the bulk
band structure. At the upper $d$-band edge the hole-lifetime is $\tau_h \geq 22
$fs, i.e. more than one order of magnitude larger than predicted for a
free-electron gas. Following calculations for $d$-hole dynamics in Cu (I.\
Campillo et al., Phys. Rev. Lett., in press) we interpret the lifetime
enhancement by a small scattering cross-section of $d$- and $sp$-states below
the Fermi level. With increasing distance to $E_F$ the $d$-hole lifetimes get
shorter because of the rapidly increasing density of d-states and contributions
of intra-$d$-band scattering processes, but remain clearly above
free-electron-model predictions.
