Don & LR - the devil is in the detail on this one, annex 4.7.D.1.i - basically states that it can be a rolling four week period. So you could have an annex 4 at end of a month 7 or 8 days off and then the Co can play catch up if you had for example vacation the next month. Further there are now freighter trips where they are using the 2/14 & 1/7 down route with long layover. A day off is a period that is free from duty and of course is fair game in their book.
The new FCI seems to be taking length of discretion away from us - okay good - but increasing allowable FDP by them - sneaky.