I will still take the time to remind you that's not nice to ask people questions and demand they answer when you don't do the same, but anyhow since I'm always in a good mood making fun of doomsayers and they completely lack knowledge of economics, I'll entertain you
Just tell me what will happen next?
How will the US pay ~$35 trillion back? Do you think the US will be having trade surpluses any time soon? Will they sell their gold? What's the game plan?
Do you think the USD will keep being the world reserve currency? Is it sustainable? If so, for how long? 5 years? 10 years? 100 years? Forever? What's your guesstimate?
They will pay it back just as they have served their debt forever, since unlike Russia and China which have debt lol in USD, nobody is asking the US to take debts in rubles or yuans, and most important if you get your nose from those doomsday clocks and things you will see that the ratio of US debt to GDP is on a continuous decrease for 3 constant years!
Also, if you stop to read Chinese and Russian propaganda you will see this:
https://www.livemint.com/economy/china-vs-america-us-gdp-rises-6-3-outpacing-chinas-4-6-to-become-world-s-biggest-economy-11706236229488.html
Since you love the talk about wars so much, when was the last time that a global power that held the dominant global currency was attacked and defeated on home soil or lost 70% of its resources and territory, an event that led to its demise?
So, 10, 30, 50 years...it all depends on when Canada decided to invade and defeat the US
And seeing that Russia in Ukraine is progressing by 2.78 km2 per day, this will take about a few tens of million years.