God and Satan are both waiting for the great falling away to be accomplished. God so He will pour out His wrath. Satan is waiting because it will set perfect conditions for his takeover on earth. Obviously it is not a set time by God because He will not be making mankind or the Church fall away. Satan is always working on it. It is a condition that God knows will happen. Satan is looking for the time man is so wicked that his plan will work. Man determines the time. It will be as the days of Noah. We are making the choice as mankind and it looks in favor of Satan more and more.