There is no set length for a stanza. They can make use of any number of lines, words, or syllables. However, when it comes to the different types of stanzas, it can often be beneficial to classify them according to specific length criteria. For instance, a quatrain has four lines. However, this is not a definitive rule, and a stanza could make use of any general length, and while the length of a stanza can aid in categorizing them into different types, this is not necessarily the case.