  The emission times of laser-triggered electrons from a sharp tungsten tip are
directly characterized under ultrafast, near-infrared laser excitation at
Keldysh parameters $6.6< \gamma < 19.1$. Emission delays up to 10 fs are
observed, which are inferred from the energy gain of photoelectrons emitted
into a synchronously driven microwave cavity. ~ fs timing resolution is
achieved in a configuration capable of measuring timing shifts up to 55 ps. The
technique can also be used to measure the microwave phase inside the cavity
with a precision below 70 fs upon the energy resolved detection of a single
electron.
