Is this new, or unique to xONEx fares ? I had a DGLOB34 "built" in early July, and the price was guaranteed for (from memory) around 3 weeks. Even then I didn't end up purchasing until the end of August, and the price didn't need to be recalculated - but I did ring the AA desk back around the end of July and ask for an "extension", which was given for an additional four weeks (from the date I rang).