I heard somewhere that it is possible that the 12 Apostles, right after Christ's ascension, believed that His return would happen very soon, that is, even during their lifetime. What evidence do we have in the Bible that might indicate that kind of thinking on the part of the Apostles?
I've looked up the Wikipedia article on Second Coming, but it only quotes the words spoken by Jesus Himself about His second coming to happen soon.
As for the Apostles, it only quotes these words by John:
"Children, it is the last hour; and just as you heard that Antichrist is coming, even now many antichrists have appeared; from this we know that it is the last hour" (1st John 2:18)
What other verses in the Bible may indicate that the Apostles expected the Lord to be back very soon?