Can't reverse known hash ?

[omegear]

No matter how long does it take, even weeks, I'll be running this because I really need this password recover.

Code:

cudaHashcat64.exe -a 3 -m 400 -i --increment-min=3 --increment-max=12 hash.txt

So this is going to test from 3 to 12 character-lenght all lowercase character right ?