There was a decade of dysfunction and ossification before the USSR collapsed within a couple months
A decade of low oil prices (affecting exports), high defense spending (increasing deficit), societal unrest due to the resurgence of nationalism, and slowing productivity all happened quietly over the 1980s before catalyzing into collapse.
The country could have continued like this for years, if not decades, were it not for a few men and coincidental events.
Good thing the US hasn't .. oh.
(the oil price is actually OK as is the trade balance, so far, but social cohesion is fraying and people are always complaining about productivity)
Did the USSR have an entire administration rapidly and deliberately tearing down their government, or was it more of the cracks in the foundation finally giving out?
Just because the former took a decade doesn't mean that this will require the same amount of time.
If the USA gets a repeat of the USSR collapse, you're looking at an independent Texas and California (and perhaps Hawaii?) within a few years, 50% GDP loss, proper hyperinflation, infighting over the nuclear arsenal being under federal authority or the authority of whichever state it happened to be physically in at the time, and a 6-7 year reduction in life expectancy.