All.

All encryption is breakable. You aren't choosing an unpickable lock, you are picking how good of a thief it will take to rob you.

A 4096 bit encryption might make it really expensive to attack you, but those old numbers about "it would take a computer 40,000 years to crack" don't matter much in a world where that just means you spin up 160k instances in the cloud for 3 months.

That's a Dollar amount that makes cracking YOUR bank account not worth doing. But if it were the Nuclear launch codes for Russia's arsenal it would not be undoable.