So sorry for the slow reply. I missed a few posts a couple weeks back...
If using a specified ocean SST your equilibrium time will be less than 5 years (though we usually like to run experiments for 10 years and average the last 5 for our results).
If using a predicted ocean SST (mixed layer ocean runs) it may take as much as 30-100 years to reach equilibrium depending upon the size of the forcing applied.
If using a predicted ocean SST and a transient forcing (using the EdGCM Trends sections) the run will only come into equilibrium 30+ years after the forcing becomes constant.
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Dr. Mark A. Chandler
CCSR/GISS, Columbia University
2880 Broadway, New York, NY 10025
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