Report of "Power On" minutes per week or month

[cnielsen]

I think I'd like a general idea of power usage. I'm interested in the number of minutes all of our non-VM windows machines have been powered on. It looks like there is a value at the bottom of the weekly/monthly uptime calendar named "Asset on total". How do I gather that into a single report for all of my machines?

[RCorbeil]

Last time a question was asked about getting access to the data or calculations behind the uptime calendar, the answer was that it wasn't readily available to us.

[cnielsen]

Any help on this please?