How long can permanent residents stay abroad?

If you are a lawful permanent resident (green card holder), you may leave the United States multiple times and reenter, if you do not intend to stay outside the United States for 1 year or more. 16-Mar-2022

https://help.cbp.gov/s/article/Article-820?language=en_US#:~:text=If%20you%20are%20a%20lawful,for%201%20year%20or%20more.