I am from Pakistan and my age is around 25years old, my parents have been living in USA from last two years and they have green card but not citizenship. I applied for Immigration (as unmarried son) on behalf of my father. Now my parents want to come back Pakistan for at least 1 years, so I am bit concern about the time effect on my process and my parents citizenship process duration. My queries are following on behalf of this.
What exactly the maximum time duration to stay outside of US without permission(for green card holder)? I mean they can come to Pakistan for 5 months without any permission and this 5 months will not effects of duration of my process and their Citizenship? as this thread's answer suggest me that your parents have to get permission first to leave US for so long time but I am not sure how much time.
How and where to get Permission for leaving US for at least 1 year?
Need some authenticated answer on this because my parents want to move back Pakistan for at least one 1 year.
Thanks in advance.