As totally a passenger these days and luckily one who gets quite a few long haul flights I can only say that there is NO WAY in the world that I would sit in a flight of 19hrs even in J class. Having done quite a few 13+ hr flights I find that well and truly long enough so if QF or any others are considering these ultra long haul flights then they can go and well and truly stuff them up their ar**.
A couple of hours break in between breathing nice fresh sea level air and perhaps a shower does wonders for the next sector.
I would not do around 19+ hrs flights even if it were almost free!!!!
