I have been refused boarding by EZY showing up exactly 30m (to the minute) before departure, but they usually give some flexibility (I'd say -20 on average). This very morning out of SXF I had the surprise of the captain making the announcement that he would wait a little to allow pax to clear security (which was indeed crowded). I muss say that's the very first time I've witnessed such a gesture in probably 500+ EZY flights!