Many projects, especially math based scanning things have WU's that run in stages. They (for instance) do a scan of data and if nothing interesting, then finish quickly... other times the scan is positive invoking more detailed analysis and the WU takes longer. MATRIX manipulation is similar when applied to some life science projects, neuron simulation, growth prediction, and such. Sometimes the tasks complete quickly all according the starting parameters.
So, it is very normal for many WU's to vary in length of time. This is often NOT the case in other projects like protein folding and such... or graphical manipulation WU's... all depends on what is being done.
Sooo, for those variable projects, averaging really doesn't give the correct picture. The purpose of the spreadsheet is to give folks a "general" idea of what to expect and is highly hardware dependent.
Nevertheless, one can scan the projects and hardware entries and get a fairly reasonable idea of how projects play and that's the whole point of the spreadsheet.Edited by Tex1954 - 11/23/12 at 9:20am