Is the 7th trumpet the "last" trumpet found in the Bible, or is there an 8th trumpet?
Seven angels were give seven trumpets. Revelation 8:6
In Revelation 8:13, John hears and sees...
13 And I beheld, and heard an angel flying through the midst of heaven, saying with a loud voice, Woe, woe, woe, to the inhabiters of the earth by reason of the other voices of the trumpet of the three angels, which are yet to sound!
Revelation 8:13 is the verse you are ignoring. Revelation is not a straight through reading timeline.
Segment are. But not all of Revelation.
The sounding of the 7 angel in Revelation 11:15 refers back to Revelation 10:6-7, no further wait,
Revelation 10:7 But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God should be finished, as he hath declared to his servants the prophets.
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Revelation 11:16 And the four and twenty elders, which sat before God on their seats, fell upon their faces, and worshipped God,
11:17 Saying, We give thee thanks, O Lord God Almighty, which art, and wast, and art to come; because thou hast taken to thee thy great power, and hast reigned.
The 24 elders are praising Jesus, who has been given all power in heaven and on the earth, Matthew 28:18, because he asserts his great power to take the kingdoms of this world out from Satan's hand.
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The seventh angel sounds, no further delay, the time has come for mystery of God be finished.
Do the kingdoms of this world become the kingdoms of God, and Christ "forever" in Revelation 11:15?
How long is "forever"?
Yes, the kingdoms of this world become the kingdoms of God and Hos Christ, at then end of the great tribulation, including the time, times, half times which Satan is cast down to earth, ending when Jesus returns.
Did Christ describe the judgment of "all" the dead in John 5:27-30?
Is the time of the judgment of the dead found in Revelation 11:18?
Well you said "forever", didn't you ? Those things happen in the "forever" timeframe.
Did Paul say Christ would judge both the living, and the dead at His return, in 2 Timothy 4:1?
Do we find the living nations, and the wrath of God, in Revelation 11:18?
To take place in the "forever" timeframe.
