Well aside from the "no man knows the day nor the hour" escape clause, it is made more than clear in the bible the authors of the New Testament and those who [I would say] placed words in Jesus' mouth expected his return in their day and age. An example is in first Peter where the author writes to his audience and tells them they were living in the "last days" only to find [perhaps] the same author backtracking in his next book.

In the book of Mark as Jesus stands in front of the High Priest, he is asked by said High Priest if he (Jesus) was the one. Jesus tells him [allegedly] that he [the High priest] would be alive to see him come back in glory with his angels. That High priest is dead 2,000 years over now.