I found this in the help center:
Who can put questions "on hold"?
Users with 3000 reputation can cast up to 24 close votes per day. When a question reaches 5 close votes, it is marked [on hold], and will no longer accept answers. Those users may vote to reopen questions the same way. Each user may only vote to close and reopen a given question once. (For example, if you vote to close a question that is closed and then later reopened, you cannot vote to close it again.)
My question is: Are the number of votes needed to reopen a question once it's been edited equivalent to the number of original close votes? If not, how many votes are needed?