tim222 - 5:50 pm on Oct 1, 2013 (gmt 0)
When did you receive the email? If it was yesterday (Monday) then there's no difference between 72 hours and 3 working days.
"It doesn't matter how many days we work, the regular US work week is from Monday to Friday"
That sounds more like an employee than a business owner. If you owned a retail shop open Monday to Friday and received a report on Friday night that something was endangering your shop (i.e., broken storefront window), would you wait until Monday to address the problem? You've been around WebmasterWorld long enough to know that an email from Google with a deadline is serious business.