Is Password Cracking That Important in a Hackers Life ?

Hi, I'm making a decision about what gpu/s to get,

so I want to know how often does a hacker use his gpy/s to crack a password ?

How many times ?

How much time does it take for a normal/medium passwod to be a cracked with your gpu (list your gpu please) ?

And can you specify where exactly I will need to crack a password (all or most of the things) please ?

Thanks in advance.