You really can't get away with "Free for a limited time." The Commentary specifically calls for the time period to be stated (refer to David's post above). So indicate specifically what that time period will be. "Free for the first year" is acceptable, as would be "Free until 1/1/2008."
There's really nothing in the regulation that specifically requires that this wording be in the body of the ad. It is certainly the type of information that many banks tend to include in the "fine print," usually with a footnote indicator in the ad body. I think the Fed has been really careful not to define what it considers "clear and conspicuous" for Regulation DD.
Unless you have state rules that will require that the time period be within in the ad body, I believe that putting it in the small print is acceptable. As with all fine print, it should be legible to most readers.
_________________________
John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8