The Lord himself will come down from heaven with a loud command, with the voice of the archangel, and with the trumpet call of God. And the people who have died and were in Christ will rise first.
Paul wrote that those LIVING THEN Would see END AND WOULD BE Converted to be member of Kingdom
1 Corinthians 15:51 But listen, I tell you this secret: We will not all die, but we will all be changed. 52 It will only take the time of a second. We will be changed as quickly as an eye blinks. This will happen when the last trumpet blows. The trumpet will blow and those who have died will be raised to live forever. And we will all be changed.
The Writer Paul and the Letter Receiver would see Jesus Coming.
2 Corinthians 1:14 14 just as you already understand many things about us. I hope you will understand that you can be proud of us, just as we will be proud of you on the day when our Lord Jesus Christ comes again.
Writer Paul would see End of world in his Life time.