Extention of stay in Pakistan for a US citizen on visit visa

#1
Hi.
I am a US citizen of pakistan origin. I applied for visit visa to travel pakistan. I hv got a multiple (5 years) visit visa. And on my visa there is a duration of each stay is 1 year written on it.
Kindle tell me, that i need to stay more than a year, my parents r there, will i have to leave pakistan within 1 year, is it must? If there is any extention of stay is required, so for how long i can get the extention of stay?
Is there any other way by which i can stay as long as my visa is valid?

Thanks
I will appreciate ur response.
 
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