Smith 1999. Op. cit is contrasted with ibid., an abbreviation of the Latin adverb ibidem, meaning in the same place; in that very place which refers the reader to the title of the work in the preceding footnote. The easily confused idem (sometimes abbreviated id.
Just to be safe I would have to say leave it in a room temperature area; away from any windows or heaters that can affect the temperature of the egg; for about 6 or 7 hours at the least.
How long can hard-boiled eggs be exposed to room temperature before posing a health risk? A: The United States Food and Drug Administration states that freshly made hard-boiled eggs should not be exposed to room temperature for more than two hours ...