Trips over 6 months may raise questions about abandoning residency.

Trips over 12 months require a reentry permit or else the green card may be considered abandoned.

Green Card holders should avoid staying outside the U.S. for more than 6 months. Over 12 months without a reentry permit can cause you to lose your Green Card.

Trips over 6 months may cause extra questioning at reentry, and trips over 1 year usually require a reentry permit.