Board Thread:Questions and Answers/@comment-2601:48:C600:58BE:D160:6BB4:3A8A:B182-20180304173542/@comment-1200981-20180307134201

Not particularly. The events of Ordinal Scale took place in April and it seems like this prologue takes place in October, so six months (i.e. half a year) sounds accurate. I think the only issue is that Kirito stated that he's never been to Asuna's residence before Volume 9 while we clearly see him visiting her there twice in the movie. Kawahara may need to address that.