What about "CPU Days"

Further to the "Bottom Participants" theme...
What about a measure showing CPU days?
BOINC already records CPU seconds for each result, it wouldn't seem to be too hard to create a measure that showed Total and Recent Average CPU days.
This would be a measure of how much of every participant's resources were devoted to the Einstein project.
It might be expressed as a percentage, ie:
Total = Days spent on calculating results / days since joining Einstein at home, and a simimilar calculation for the last seven days.