  The tunneling time through an arbitrary bounded one-dimensional barrier is
investigated using the dwell time operator. We relate the tunneling time to the
conditioned average of the dwell time operator because of the natural
post-selection in the case of successful tunneling. We discuss an indirect
measurement by timing the particle, and show we are able to reconstruct the
conditioned average value of the dwell time operator by applying the contextual
values formalism for generalized measurements based on the physics of Larmor
precession. The experimentally measurable tunneling time in the weak
interaction limit is given by the weak value of the dwell time operator plus a
measurement-context dependent disturbance term. We show how the expectation
value and higher moments of the dwell time operator can be extracted from
measurement data of the particle's spin.
