  We propose a relatively simple method to measure the event time in liquid
Argon (LAr) TPC-based neutrino detectors that takes advantage of the
topological reconstruction of each event from the TPC data prior to performing
a one-parameter fit. Measured times and positions of detected photons are fit
to the expected pattern of light from the tracks as reconstructed using the
electron drift. The event can be treated as a rigid body with only the neutrino
interaction time as a free parameter. The optical properties of LAr are
comparable to those of water for Cherenkov light in visible wavelengths.
Data-Monte Carlo comparisons of the light patterns, given the known track
topology from electron drift, enable in situ calibration of the optical model
and further optimization of the timing. A back-of-the-envelope calculation
predicts that the single parameter fit for the interaction time requires a
significantly lower photodetector coverage than needed for the same precision
in conventional warm-liquid detectors.
