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.
The time it takes to hard-boil an egg depends on the size of the egg. Give the egg time to reach room temperature, usually about 12 to 15 minutes. Place the egg(s) in a pan of water and wait for it to boil (about eight to 10 minutes; less time if you cover the pan with a lid). You can also add a pinch of salt to the water to get it to boil faster.