Maybe you you a slow twitch eye, but for me, the twinkling of an eye is very fast. Note below - Trumpet sounds, dead rise, we rise if still alive, then it says WE SHALL BE CHANGED - we as in the dead, and those alive, twinkling of an eye.I'm using both 1 cor. 15 and 1thess. 4 if you read it together you'll see that there has to be a gap, no other explanation how big is the question my thinking is a few minutes, won't be hours or as little as a second or two.
1 Corinthians 15
51 Behold, I tell you a mystery: We shall not all sleep, but we shall all be changed— 52 in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised incorruptible, and we shall be changed.
1 Thessalonians 4
15 For this we say to you by the word of the Lord, that we who are alive and remain until the coming of the Lord will by no means precede those who are asleep. 16 For the Lord Himself will descend from heaven with a shout, with the voice of an archangel, and with the trumpet of God. And the dead in Christ will rise first. 17 Then we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air. And thus we shall always be with the Lord. 18 Therefore comfort one another with these words.