I'm sort of inclined to support Lodestar here.
QR DCAM has adopted JARs and called them QCARs
Not the sort of book I have at home where my computer is so cannot check min cabin crew requirements.
UK regs if I recall correctly requires one CA per 50 pax, minimum one CA for 20 pax and/or one per operational pax door. JARS must be similar.
2x5hr sector +plus 1hr check in +say 2hr turnround a bit long, but obviously legal otherwise could not be rostered. Even QR has a FTL scheme.