"At full length" is a phrase that describes something that is done or said in its entirety. There are various synonyms that can be used to replace this phrase, depending on the context or intent of the message. Some of the common synonyms include "completely," "fully," "thoroughly," "in detail," "precisely," "exactly," "minute by minute," "from start to finish," "in depth," "at great length," and "extensively." Each of these synonyms is interchangeable with "at full length" in various contexts and can be used to convey the same meaning. Therefore, it's essential to choose the appropriate synonym that best matches the intent of the sentence to express a clear message.