How often do I renew my US green card?
A standard permanent resident card is valid for 10 years and is renewed with Form I-90. A conditional 2-year card is not renewed; instead you file Form I-751 or I-829 to remove conditions before it expires.
Does an expired green card end my status?
No. Your permanent resident status does not expire when the card does, but an expired card makes it hard to prove status, travel, or work, so you should renew promptly with Form I-90.
Can long trips abroad cause me to lose my green card?
Yes. Absences of six months or more can raise abandonment questions, and a year or more can be treated as abandonment of residence. A re-entry permit obtained before leaving protects trips up to two years.
How do absences affect naturalization?
Trips of six months to a year create a rebuttable presumption of breaking continuous residence for naturalization, and a year or more generally breaks it, delaying when you can apply for citizenship.