What verses in the Bible indicate that Apostles expected Christ to come back very soon? 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?
As was noted, I don't think there are many. Rev 1:1 comes to mind and "shortly."
Another one might be,


  1 Cor 7:29 But this I say, brethren, the time is short: it remaineth, that both they that have wives be as though they had none;
  30 And they that weep, as though they wept not; and they that rejoice, as though they rejoiced not; and they that buy, as though they possessed not;
  31 And they that use this world, as not abusing it: for the fashion of this world passeth away.


The problem is whether these things are to be understood spiritually as did the early church fathers, or as earthly historical events, which is the preference of many modern scholars. To see how the church fathers handled terms like "this generation" (Mat 24:34, Mark 13:30-31, Luke 21:32-33) check the Catena Aurea.

Catena Aurea