This is a common misconception about passwords. It depends on your definition of password. You have to first define what you mean by password, such as "8 alphanumeric characters". Once you define that, then we can calculate.
An "alphanumeric" is 26 upper case, 26 lower case, and 10 numeric characters, or 62 possible combinations.
To try all combinations of an 8 character password, that would be:
62 * 62 * 62 * 62 * 62 * 62 * 62 * 62
Divided this by 13094 (the number of hashes per second), and you get 16674820955 seconds, or 528 years.
The impracticality of trying all combinations leads to other strategies, such as instead choosing dictionary words or "Markov Chains" to test the sorts of passwords are likely to choose, instead of trying all random combinations. You can't mathematically calculate how fast this is because it's entirely subjective. It depends upon luck, what passwords the targets have chosen, and what passwords you've chosen to test. It's often something of the order of a 10% chance of cracking a password with a few hours of cracking, but again, that's subjective experience. Depending on whose password you are cracking and how you are cracking it, your experience will vary.
Anyway, the point is that this question has no answer. It's a misconception of how things work. And that's why you can't google the answer.