'Short' in the Bible

Therefore rejoice, heavens, and you who dwell in them. Woe to the earth and to the sea, because the devil has gone down to you, having great wrath, knowing that he has but a short time."

and cast him into the abyss, and shut it, and sealed it over him, that he should deceive the nations no more, until the thousand years were finished. After this, he must be freed for a short time.