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If you have information that's been hashed, let's say a password, it can't be reverse hashed; but, you can go about hashing every password imaginable (a.k.a. brute force attack) until you get a matching hash result. Then you'll have discovered the password that was hashed.
Starting with a known password, hashing it; then, putting different kinds of computers through the discovery process, you can see how long the different computers take to come up with matching hash results. You can verify the accuracy of the result since you know the password that was hashed to begin with.
You already know what the right answer is whether it takes 200 seconds for a quantum computer; or, would take 10,000 years for the fastest current supercomputer, doing so-called reverse hashing, to spit out a match.
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