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 I have a favorite number. It’s insanely large, and would take millions of years of sustained effort for anyone to find it. 
 Or a quantum computer 
 In that event, we’d all be fucked. 
 I laugh when people bring up quantum computers breaking bitcoin. Any quantum that breaks bitcoin also breaks visa, mastercard, amex, your bank, ssh, https, and on and on. Accept the risk or be a hermit in a cave. 
 qubits are overrated 🤣 
 0 is good for me 
 696969696969 
 I knew that was it! Booyaa 
 21,000,000 
 21 million 
 Or 20999999.9769 to be exact 
 So if Dinosaurs had Bitcoin, we'd be cracking their keys right about now? 
 LOL 
 Key cracking is not something that actually takes “progress”. The billions of years estimate is the time to check all keys.

But you could find the key early, or very late, or in the middle of the process.

So you might be unlucky and get your key found in days 
 unlucky would be an understatement, but it's also extremely, extremely unlikely

the only way to shortcut brute force is if you know the RNG doesn't generate random keys but rather there is a pattern, trying those out first can be a days thing but for real any decent entropy key a decade is not even likely 
 3.14159… 
 42 
 42