I know you're just being a smartarse qrh but not all the turns are long night ones.... flatmate other day left at around 10 back by mid to late afternoon, I think she did a single GCC turn.... I know the CC are sometimes rostered doubles eg DOH/BAH, do they roster these for the flight crew as well? I'm not sure why but some are done as singles, whereas the CC will do a double. Training sectors perhaps?