Creating a recurring task through workflows

Creating a recurring task through workflows

Under the leads module we have a field called 'Quote Live?' - this is a mandatory field and upon creation the user will select 'Yes' (given it's a new lead); I want to create a workflow whereby an automatic, recurring task is created that'll prompt the user to contact the lead every 7 days but I'm at a loss at how to do this.

There doesn't seem to be any obvious option when I'm trying to create the workflow rule - last modified time / activity etc doesn't seem relevant as the relevant data ('Yes') is inputted as default whenever a new lead is created.