  We consider the possibility that future wide-field time-domain optical
imaging surveys may be able to discover gravitationally lensed quasar pairs
through serendipitous measurements of their time delays. We discuss the merits
such a discovery technique would have relative to conventional lens searches.
Using simulated quasar lightcurves, we demonstrate that in a survey which
observes objects several times each lunar cycle over the course of five years,
it is possible to improve the efficiency of a gravitational lens search by 2-3
orders of magnitude through the use of time delay selection. In the most
advantageous scenario considered, we are able to improve efficiency by a factor
of 1000 with no loss of completeness. In the least advantageous scenario, we
are able to improve efficiency by a factor of 110 while reducing completeness
by a factor of 9. We show that window function effects associated with the
length of the observing season are more important than the total number of
datapoints in determining the effectiveness of this method. We also
qualitatively discuss several complications which might be relevant to a real
time delay search.
