With automated voucher promotion scheduling, you can set any voucher to be promoted to Facebook and/or Twitter at any time and to recur at any set frequency.

So in this case you want to set your voucher to promote on Black Friday and end after 7 days or so promotion 2 or 3 times over the 7 day period through Cyber Monday. Choose days and times which you think will suit your audience.

The promotion scheduler puts you in complete control.