The air line suggests you arrive 2-3 hours early. But in reality, 1.5 hour supposes to be enough as TY said. The earilier the better, just in case there is something comes up.
it also depends on your flight's timing. should there be many flights taking off at that time, you have to be there earlier due to the long queue for boarding check. so, suggest you to arrive there at least 2 hours ahead if that is the case.
