do you mean as in the Dev's will delete a guild?
I"m going to take a chance and say no. I would think if a game even private server was to clear out certain things it would be many months to year/s before they would do that.
as far as I can see in this game unless you pass the lead to someone else from your guild the guild and your lead of it will remain there after just a month.
I"m only basing this on games I've played and while I haven't played tons of mmo's I have never seen something where the lead of their guild loses lead unless they change that themselves.