  We study the impact and subsequent retraction dynamics of liquid droplets
upon high-speed impact on hydrophobic surfaces. Performing extensive
experiments, we show that the drop retraction rate is a material constant and
does not depend on the impact velocity. We show that when increasing the
Ohnesorge number, $\Oh=\eta/\sqrt{\rho R_{\rm I} \gamma}$, the retraction, i.e.
dewetting, dynamics crosses over from a capillaro-inertial regime to a
capillaro-viscous regime. We rationalize the experimental observations by a
simple but robust semi-quantitative model for the solid-liquid contact line
dynamics inspired by the standard theories for thin film dewetting.
