How does US Green card holder live in UK?

how long a us green card holder live in uk

Green card holders can travel abroad for a maximum period of 180 days on each trip. If you need to stay outside longer for employment or religious purposes you should apply for reentry permit using application travel document, the Form I-131 which is valid for 2 years. Also you can use the Form N-470 meanwhile to preserve residence for naturalization process.