The term model year in computer modeling is used for calculated equations describing one calendar year of data. If a climate model, for example, is calculating the climate from 2015 to 2020, the computer has to calculate 5 model years, however it most likely takes much less time for the computer to do so.
The term is used in descriptions for models like climateprediction.net, which has produced about 125 million model years of data until May 2011.
References
Model year (computer modeling) Wikipedia(Text) CC BY-SA