how to apply for my parents???

i am american citizen . i want to bring my parents to live here in usa. my questions are:

1. they need to be here or they can be home
2. how long take the process until they became permanent residents

i am american citizen . i want to bring my parents to live here in usa. my questions are:

1. they need to be here or they can be home
2. how long take the process until they became permanent residents

Depends what city you livr in if they are here in U.S. About 6 months to 2 years is avereage. If overseas, about 1 year.

Check under BCIS official website. Browse under topic how to bring relatives to live in US. They have complete instruction there and how. Good luck.