For what is our hope, or joy, or crown of rejoicing? Isn't it even you, before our Lord Jesus{TR adds "Christ"} at his coming?
Although the meaning is brazenly imported, at times, into this text, there is no indication here that Paul expected the Second Advent to happen in a few days.  It is true enough that some of the Thessalonians mistakenly assumed that to be the case; but Paul wrote another letter to them for the specific purpose of correcting such false interpretations.