Since you have kept my command to endure patiently, I will also keep you from the hour of trial
Revelation 3:10 Since you have kept my command to endure patiently, I will also keep you from the hour of trial that is going to come on the whole world to test the inhabitants of the earth.
The Great Babylon falls in one hour. I think this is a reference to that. I think the apostate church became the Great Babylon and many lukewarm Christians and nominal believers will be left behind. But look at Philadelphia. They kept the Lord's commandment. How many Christians and pastors and churches these days decide which commands to keep and which to ignore? The command was to endure. We must take a stand for the Lord and for His word. It will result in us being mocked, ridiculed and suffer persecution. But we are crushed but not destroyed. If you love the Lord, if you see there will be a better kingdom then it is a small price to pay. And the command was to endure patiently. You hear so many saying "how long". Enjoy every minute knowing that once this is over it will just be a memory.
Revelation 17:12 “The ten horns you saw are ten kings who have not yet received a kingdom, but who for one hour will receive authority as kings along with the beast
The beast arrives at the start of the tribulation and is here for seven years. However, the ten kings appear to be a temporary measure, like a bridge loan, to get us from the collapse of the US dollar to the mark of the beast. The one hour that Philadelphia is kept from is most likely the one hour that it takes for Babylon the Great to fall. The fall of the US will impact the entire world's economy, and so BRICS will step in to keep things running until the mark of the Beast can become active.
Revelation 18:19 They will throw dust on their heads, and with weeping and mourning cry out: “‘Woe! Woe to you, great city, where all who had ships on the sea became rich through her wealth! In one hour she has been brought to ruin!’
This would also seem that this hour is a reference to the seven years as well. It is very clear from the Lord's word that prior to the tribulation starting everyone is acting like things are normal, then the fire falls, the rain comes and they are all destroyed. I think the seven year tribulation starts with the fall of the Great Babylon, the US. There will be a nuclear attack from our enemies, but there may also be a massive earthquake and of course the total collapse of the US economy.
I suspect the reason seven years is referred to as one hour is because it is both. If you have a one hour nuclear attack to kick off the tribulation the total outworking of that will take seven years, but it all came in one hour. You will see the stock market collapse in one hour, you will see the global financial system and banking system collapse in one hour. But famine, pestilence, plague, war, these things will take seven years to be fully worked out.