Curious about password cracking data

I've been finding the same chart and data on cracking a password that shows a 12 char password with numbers, upper and lowercase letters, and symbols would take a computer \~34,000 years to crack. I'm guessing that's based on using a brute force attack. However, none of these articles denote computer power beyond "a computer". Is there any data or estimates of how secure passwords of varying lengths and complexity are given increasing computer power? For example, if a hacker …

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