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For long gtobssim runs (of order 1 year) with a "complete" sky model (e.g., obssim3), we still encounter duplicate event times, probably owing to the intrinsic single precision of the random number generators we are using. See the discussion from obssim 21. As per Toby's suggestion, we have implemented a 26 micro second deadtime: photons with arrival times within this window relative to the previous photon will be discarded. This should result in a loss of a few hundred photons over the course of a year. observationSim v8r1v8r1p2, for now still only in ST LATEST.
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