But the FFN Terms and Conditions say:
***A minimum of a three-night award stay is required for Faster Free Nights Award(s) redemption in non-resort hotels during mid-week (i.e., Monday through Thursday). One or two-night stays at non-resort hotels are available on weekends only. A weekend is generally defined as Friday through Sunday, but may vary to conform to local custom and practice in certain countries.
So is it possible to just book one night during the week?