How long are the food court and shops in the airport open till?

Some 24/7, but some close at 9pm

Some are only open 24/7

Some open 24h

It depends on where you're trying to eat but a lot of them are open at 10 and 11pm.

Some 24/7. Not the main food courts.

It should be 24/7 there or it least some of them.