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Is this even something one should be worried about?
How long would it take for all the Bitcoin Key pairs to be calculated?
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No, you shouldn't worry about it.
3Blue1Brown has made a great video explaining how large 256 bit is, check it out
This is more fun to calculate for yourself than to ask for the answer. Why not try it and ask if you get stuck? – Nate Eldredge – 2019-11-13T19:45:25.777
I guess I should take the time it takes to calculate a single key pair and multiply it with the total number of private keys, not the total number of possible addresses (to account for expected(?) collisions). So, totalTime = singleKeyPairTime * 2^256. Right? – Nikos Lykouresis – 2019-11-13T23:06:44.410
Sure. Of course, they could be computed in parallel, so if you want the real time required to calculate all keys, you should divide by the number of machines being used. – Nate Eldredge – 2019-11-13T23:15:01.493
The closest I have come to answering how long a single ECDSA key generation takes is "some milliseconds". I ran the numbers and even if you run thousands of computers in parallel + assume one computer can calculate tens of thousands of keyGenerations/s, the infinitesimally small percentage of public keys you will find in your lifetime, is simply not worth it. – Nikos Lykouresis – 2019-11-14T02:06:05.670