Premium Site Lead Duplication Cycle

Do we have a de-dupe cycle? (If a lead comes to our site, downloads the Buyer's Guide, and then does it again six months later, is that considered a new lead?) 

What is the time frame for this type of duplication?

Leads have two parts:

A) Accepting Leads: 

We reject any lead from the same user with the same lead_type and data (e.g., category lead, category ID) on the same day.

B) Delivering Leads:

If this lead/user has been delivered to the campaign, it will not be delivered again. In addition, if the user/lead has been delivered to another of the vendor’s campaigns that have overlapping categories with this campaign and it’s within six months of the delivery, it will not be delivered.