1. You can only hold for 72 hours.
2. Mine took approx. 10 days.
3. They used to not charge any YQ, but now it seems they are sometimes charging it. AUH-LHR (which should be around 30USD w/o YQ) was USD 200.
4. Etihad website is accurate from OZ's screens. Some worldwide offices can book Etihad, but others cannot - if in doubt, call the Korean line during Korean business hours.