It is not possible for all of the prophecies in Revelation to be fulfilled in our generation. Most of Revelation will be fulfilled during the seven-year tribulation, but the millennial reign of Christ on earth will last 1,000 years. After the thousand years, Satan, who will have been bound during this time, will be set free for what is described as a “little season.”
“And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years, And cast him into the bottomless pit, and shut him up, and set a seal upon him, that he should deceive the nations no more, till the thousand years should be fulfilled: and after that he must be loosed a little season” (Rev. 20:2-3).