Israel’s military has informed the United Nations that the entire population of northern Gaza should relocate to the southern half of the territory within 24 hours, the U.N. spokesman, Stéphane Dujarric, said late on Thursday night, adding that such a movement — involving over one million people — would lead to “devastating humanitarian consequences.”
I don’t think the expectation is that 100% of all civilians will be able to relocate. But at least 600k have already managed to (saw that number on the news and can’t find a reference any more…oh well).
I doubt Hamas will manage to relocate large amounts of their ordnance in that timeframe, certainly not with the civilian traffic. At least, not without exposing themselves as a potential target.
So they have the option of moving personnel and mild amounts of equipment, but will need to decide how much of a stand they want to make.