1 1/2 hours should be fine. We left on a Friday recently and had checked bags and it was under an 1 1/2. Note that there is not much in the way of food selection- we stopped and picked up sandwiches at Zee Best and were glad we did. Also, the upper level of departures looks pretty modern and was well airconditioned and appointed ( though no water fountain ). We departed on B gates, which was downstairs, pretty crowded and still looking quite rough.