The term 'quite quickly' can be expressed in two ways: 'APACE' (5 letters) and 'in a jiffy' (8 letters). 'APACE' is an adverb meaning 'at a quick pace' or 'SWIFTLY'. It is derived from the Middle English phrase 'a pace', which means 'at a single step'. 'In a jiffy' is an informal phrase meaning 'very quickly'. It is believed to have originated in the late 19th century, and is likely derived from the word 'JIFF', which was used to describe a very short period of time.