For Paul the apostle, writing to the Romans about 58 AD and put to death about the year 62,  the master of the house, Jesus Christ, is coming soon. 

Luke, a disciple of Paul, writing his gospel about the year 80-90, had to deal with the delay in the coming of Jesus the faithful of his time faced. Why was the great promise they were expecting delayed? He deals with that question in his gospel today. ( Luke 12:39-48)

The servant who is blessed keeps watch through the night without concern for what hour his master arrives, Luke writes.  Whenever his master knocks, his servant is there to welcome him. The master comes at “an unexpected day and at an unknown hour.”  

” Luke accordingly shifts the early Christian emphasis away from the expectation of an imminent parousia to the day-to-day concerns of the Christian community in the world. He does this in the gospel by regularly emphasizing the words “each day” (Lk 9:23; cf. Mk 8:34; Lk 11:3; 16:19; 19:47) in the sayings of Jesus. Although Luke still believes the parousia to be a reality that will come unexpectedly (Lk 12:38, 45–46), he is more concerned with presenting the words and deeds of Jesus as guides for the conduct of Christian disciples in the interim period between the ascension and the parousia and with presenting Jesus himself as the model of Christian life and piety.” ( Commentary NAB )

It’s interesting how closely related are our readings from the Letter to the Romans and the Gospel of Luke. Some today search for signs of the last days in new visions and revelations; some see the question better left to science. 

Luke’s message is best.