NTLM hash, how practical is it?

[mido15]

Hi, I'm a kind of a noob at cryptography but I am trying to learn about cracking hashes. And I've got a an NTLM hash and a R9 280X, I was wondering how practical would it be to crack that hash using that card keeping in mind that all I know about the password is that it's supposed to be a strong one, and I've tried oclHashcat with a 14 char mask with lower,upper,dig and special and est time is >10 years, I understand the possibilities are huge but is there any practical way of approaching this problem?
Thanks