As much as possible, take all the calls and lack thereof in stride. During EA, a lot of people thought the calls were done at 10 am EST because there was a lull on the message board, but really, it's just that one AdCom member finished their list, and no one else had started. There is no rhyme or reason to how they make calls. Likely, each AdCom member has a list of names that they plan to call. Equally likely is that they each have their own schedule and will have their own window(s) to make these calls. They will likely continue up til (and after) the 5 pm notification time, so no point in losing hope until then.