For future reference: three hours before the flight. There’s nothing to do before check-in (not even a coffee shop in sight). Nice new airport though. IGA Lounge was not too full and we didn't have to queue (although there was a queue as we were leaving the lounge).

For those without lounge access, there are numerous nap areas, eateries, etc. Honestly, there’s more space than people know what to do with.