I think quite a bit more than that. Most storms that form in them mid-atlantic take about a week before landfall, and some of them have stalled and sat spinning for a while. An example of a fairly long storm last year was Jeanne which developed on the 14th and didn't dissapte until the 28th - 14 days. An even better example is Kyle from 2002 which developed on the 21st and didn't dissapate until the 12th, or 21 days later. Franklin isn't anywhere near any of these in length.

I don't exactly want to spend the day studying old storm tracks to grab their dates - if anyone knows of what the record is please post