At 1.2 subs a year if Australia wanted to buy twelve subs. That would be a ten-year production run and a ten-year gap of no new subs for the Americans.
Americans aren’t making as many nuclear submarines as they need’: Shoebridge - Sky News Australia
Not to worry Australia you got this.
Will all submarines, even nuclear ones, be obsolete and ‘visible’ by 2040?
There are also warnings that different technologies will render the ocean “transparent”, so even the stealthiest submarines could be spotted by an enemy force.
The Australian National University’s National Security College report Transparent Oceans? found that transparency is “likely or “very likely” by the 2050s, a decade after Australia’s new fleet of nuclear-powered subs is due to enter service.