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\subsection{Sampling}  \label{sec:sampling}  Phil The current state-of-the-art lens monitoring campaign, COSMOGRAIL, typically visits each of its target every few nights during each of several observing seasons each lasting many months. For example, \citet{Tewes++2012} present 9 seasons of monitoring for the lensed quasar RXJ1131$-$1231 where the mean season length was 7.7 months ($\pm 2$ weeks) and the median cadence was 3 days. These observations were taken in the same R-band filter, with considerable attention paid  to write this, Greg photometric calibration and PSF estimation based on the surrounding star field. This data allowed \citet{Tewes++2012}  to fill in numbers. measure a time delay of 91 days to 1.5\% precision.