There is a problem with late announcements of ceasefire, as it makes it useless for the people who really need it.
Example: I was away for the Easter holidays and to be safe I activated vacation mode for 2 days. To have it active over holidays I had to start them 48 hours in advance. When the Easter ceasefire was announced for the period that almost overlapped with my vacation period it was already too late for me to cancel the vacation without loosing the 2 days anyways. I even contacted the support asking if there was a way to do it and all I got was a "Sorry, but...". As I consequence I wasted 2 days of vacation mode for a few hours of extra protection.
To make the ceasefire useful for the people who are planning to be away during holidays you should announce it earlier, at a very minimum 48 hours before it starts and preferably even 3 or 4 days in advance.