question qbout mask and my gpu speed

[Crim3R]

hi first of all its my first time using hashcat. so sorry for asking noob questions
well when im setting the mask like this -1 ?l?u?d?s ?1?1?1?1?1?1?1?1?1?1?1

i think the generated passes should be 11 characters right ?
so whats this ?

Code:

Password lengths range: 1 - 15

and how can i change it to 11 - 11 range?
AND im using :
GeForce GTX 550 Ti
it takes

Code:

Time.Left....: 1 year, 202 days

for a 11 characters lenght password is this good? and the speed is

Code:

Speed........:    15067 c/s Real,    15196 c/s GPU

how can i decrease the time and increase the speed .