Windows Firewall Remote IP Address Scope List Limit
Solution 1:
A Microsoft software engineer who worked on Windows Firewall provided an answer to essentially the same question:
Is anybody aware about Windows 2008 firewall limits like Max Number of Rules or Max Number of Remote Addresses?
And his answer:
There is no limit to how many rules can be added(other than the cap of UINT64 for the filterId), nor how many conditions can be in each filter (other than the cap of a UINT32 for the numFilterConditions).