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.
To bring eggs to room temperature, you can take them out of the refrigerator about 30 minutes before you plan to use them (around the time that you might take your butter out of the fridge) and leave them on the countertop.