 And finally, for the main attraction, the firework display is scheduled to begin at 9.09 p.m. and should last for 17 and a half minutes. On the National Mall, Grace Newton, WTOP News. Of course, that's great news about the boil water warning being lifted. But no matter what, bring some water with you today. 100, 105 degrees is going to feel like down there. So make sure you bring a lot along with you today.