How many keys can you check per second for just 1 address? That's the important part, never mind the comparing part, tell us how many per second for 1.
The number of possible private keys is a 1 with 77 zeros behind it, whatever that number is called. Here's what ChatGPT says:
Who told you that? 1 with 77 zeroes behind it is just 1, doesn't matter how many 0 you add behind it, the total number of keys is called N, go search for it, it is also the private key for the end range key -1.