10,000 and iirc it was about non existent meal service. The flight was delayed and they insisted on starting the meal service two hours in to a six hour flight. The plane took off at 0217 ... was told eat when they serve or STFU. The whole point of J is to sleep, not stay up in the middle of the night to eat. Oh and they were serving breakfast.... rather than starting mean service 2 hours before landing at DXB.
It as the A380, and since then I avoid J on that plane. Nothing like waiting an etertinity for food / drink