If you are outside the U.S. for more than 180 days and you seek reentry into the U.S., the border officer can make a finding that you've abandoned your green card status. This is why it is important to file an application for a reentry permit for extended absences. Upon your return to the U.S, you should be prepared to show remaining ties to the U.S. You should consult with an immigration attorney to come up with a plan.
Leonard J. D'Arrigo, Esq.| Whiteman Osterman & Hanna LLP
One Commerce Plaza | Albany, New York 12260
518.487.7642 | fax: 518.487.7777 | firstname.lastname@example.org