If they are in a dust free place and dry to touch, they do not need to be taken down.unless you need the space.
FWIW, we were taught in ye oldene dayz that if you could leave a neg to dry for twenty four hours, you would get sharper results because by then the neg had "cured."
Whether that old lab rat's advice was sound, I know not; but when I have the time I do that. when not, then he taught that a quick alcohol/water bath would dry the negs in a jiffy. I rarely use that approach.
Anscojohn, Mount Vernon, Virginia USA