About 800 days. It was a Silicon Graphics machine that was running gaussian 24/7 for calculations. When gaussian started you couldn't touch it because the resea

About 800 days. It was a Silicon Graphics machine that was running gaussian 24/7 for calculations. When gaussian started you couldn't touch it because the researcher might have forgotten to add checkpoint... We were able to stop the machine to upgrade IRIX because it wasn't Y2K compliant and without the patch nobody could be able to login.