It isn’t mentioned in the Bible, and all the verses you posted pertain to the Second Coming. Not before, not halfway through tribulation, at the end.
(Isaiah 26:20) Come, my people, enter thou into thy chambers, and shut thy doors about thee: hide thyself as it were for a little moment, until the indignation be overpast.
(Isaiah 26:21) For, behold, the LORD cometh out of his place to punish the inhabitants of the earth for their iniquity: the earth also shall disclose her blood, and shall no more cover her slain.
The problem is that the heresy has been inculcated in its victims for generations and it is comfortable... No need to do anything much because the culture and the world are supposed to be getting worse and worse. Nothing you can do about it. Nope, just sit in your church and sing praise choruses (7/11 music: 7 words, 11 notes), listen to a vapid sermon, eat potluck dinners, and wait to be “raptured”.
When the Son of Man returns to the earth, will He still find faith?
http://biblehub.com/luke/18-8.htm
He will have to shorten the time for the sake of the elect.
http://biblehub.com/matthew/24-22.htm
Read the Upper Room Discourse which starts in chapter 13 of John’s Gospel and goes through chapter 14. Pay attention to the ‘there’ JESUS relates to His disciples, as in to be with Him ‘there’ Where He Is Now, preparing a place for us. ... Not ‘here’, ‘there’ ...