I believe if someone went back over the past thirty years with campaign schedules and compared....most candidates from the convention to election day.....will take around ten days of rest spread out along the period. I think this was especially true with McCain (he probably went thirty days of the period with limited or no travel, from what I can remember of 2008).
The thing with Hillary is that she’s had a full hectic schedule since the summer of 2015, and throughout the primary period. She’s not in great physical shape. It wouldn’t surprise me if there are four more of these 72-hour down-periods before the election....especially before the debates.
She appears to be overdue for another botox treatment (before the debates). She’ll need a couple of days off for that.