Yeah the standard returns data would be annualized, for example "average return ... in this
study is 2.6 times ... in 3.5 years —
approximately 27 percent [IRR]" http://www.angelcapitalassociation.org/data/Documents/Resour...
Not a bad deal for many people, and you can make proportionately more on this per hour basis if you are able to contribute more capital to begin with.