What is meant by 'odd hour in a day'?

The term "odd hour in a day" typically refers to a time of day that is not considered common or typical. It could refer to late night or early morning hours when most people are asleep, or it could refer to unconventional times such as 3:33 AM or 11:11 PM. Essentially, an odd hour in a day is a time that stands out as unusual or out of the ordinary compared to regular daily routines.