Prewrath
According to prewrath, this passage clearly indicates that the coming of the Lord and the Day of the Lord are part and parcel of the same event, the coming of the Lord. First, Jesus arrives in the sky at His Second Coming, at which time He raptures all Christian believers, then His judgment during the Day of the Lord falls upon those who have disbelieved and rejected His lordship.
This is justified, according to prewrath, by the fact that Jesus places His return (Matthew 24:30–31) after the abomination of desolation (Matthew 24:15), which occurs at the midpoint of the 70th Week (cf. Daniel 9:27, Daniel 11:31). Thus, if the Second Coming and rapture occur after the sixth seal, this places this event after the midpoint but before the end (seventh trumpet).
Gospel of Mark
Christians of Mark's time expected Jesus to return as Messiah in their own lifetime – Mark, like the other gospels, attributes the promise to Jesus himself (Mark 9:1 and 13:30), and it is reflected in the letters of Paul, in the epistle of James, in Hebrews, and in Revelation. When return failed, the early Christians revised their understanding. Some acknowledged that the Second Coming had been delayed, but still expected it; others redefined the focus of the promise, the Gospel of John, for example, speaking of "eternal life" as something available in the present; while still others concluded that Jesus would not return at all (2 Peter argues against those who held this view).