Revelation 20:4, The Difference Between Pre- and Postmillennialism

… and they lived and reigned with Christ a thousand years.

//The millennium, from a Christian framework, refers to a period of one thousand years during which Christ will reign on earth. The technical difference between pre- and postmillennialists is simply this: One group thinks Jesus will return before the 1000 years begin, and the other thinks Jesus will return after the 1000 years are over. Also, 1000 isn’t always understood literally; it may mean simply “a long time.”

Note the word “will”...