Noob issues with oclhashcat

[Tfwnogf]

Hi
Here is step by step mask attack guide http://hashcat.net/wiki/doku.php?id=mask_attack
But 13 ?l with take couple YEARS so dont know is it worth Your work

Thanks, reading it now, makes more sense when you are not tired lol. But wouldnt cracking a 13 letter password be feasible when there are only lower case letters, no numbers, and no identical letters appear after eachother (like aa…..)?