8 And when he had opened the seventh seal, there was silence in heaven about the space of half an hour.
http://www.biblegateway.com/passage/?search=revelations 8:1&version=KJV
??
You are the only one who picked up on that. Your diligence should be rewarded.
The two Books of Daniel and Revelation unlock each other, and share one unique feature, they are filled with symbols that open up a panoramic view of earth's history from 500 BC to 3020 AD. One of the keys to unlock the prophetic time spans is that one day equals one year.
So half an hour is how long?
And how long is "about" half an hour?
It happens with the seventh seal or the last event, coinciding with the other symbols of seven, like the trumpets and candle sticks etc.
Heaven is silent because it is empty, they are bringing the human race home. They are not staying here. Its only "half an hour."