Cheryl emailed me to say that the durations shown by GWIstat were incorrect.  I looked and it turns out that GWIstat (and also gwsnap) got restarted by Condor a few times today, for reasons which are not yet clear.  Each time it restarts, the duration counters for LHO and LLO get reset to zero, since the program doesn't currently have a way to look back in time to set the duration properly.  But I have added a little code to add a greater-than sign on the duration when the program restarts, until the status changes, so at least there will be a visual indicator that the duration shown is just a lower bound.