Ok...now that I have your attention...you should know that this is based on the Mom-Calculator at Salary.com.
Every year for Mother's Day, Salary.com looks at all the jobs done by stay-at-home-moms and adds a resonable rate based on prevailing wages.
As the survey reports:
Stay-at-Home Moms work a 94.4 hour "workweek" - over half her time spent on the job is overtime. The Working Moms reported an average 54.6 hour "mom work week" in addition to their paying jobs.
Of course the Salary.com report does not tell us to whom we should submit a bill for these services. (:>
Check out this post for more information on making some real money working from home.