In basic speak, 2 x 6 day trips a month. 18 days off a month, ok take 4 out for recovery, 14 days off a month. Yep I’ve over simplified it for sure.
But this isn’t what’s being proposed. It’s mixed in with A330 flying (plenty of which is 2 or 3 pilot, back-of-the-clock), and the proposed lines give about 15 days off a month, not 18. Throw in recovery time and it’s not such a pretty picture.