These days it's not so simple.
It is true that the
minimum requirement is not to be absent form the US for more than a year.
You can also apply for the re-entry permit and that would allow you to be out for 2 years (note you have to apply in the US and then you will have to get the biometrics done)
But... the point is that every time you enter the US you have to be able to prove that you are coming back form a
temporary visit abroad and that the US are your
primary home. So it helps if you have your drivers licence, bank accounts, house/apartment, job etc in the States (and of course your tax forms filled as resident).
There was a case of a guy from Jamaica I think who would come to the States for one month every year. Eventually his green card was taken away from him.
There was a case of a guy who flew back with the reentry permit in hand and was still found to have abandoned his permanent residency.
When you take short trips to the States, lawyers advice against flying to an obvious vacation destination (Hawaii). Coz it shows you are not coming back to your home (unless you claim you home is in Hawaii..)
Also, from the point of view of citizenship application, a trip abroad for over 6 months in general breaks the continutity of residence required for naturalization (I take it you don't care about it)
Plus, PRs coming back after less than 6 month trip are in the "returning resident" category which changes to "seeking admission" after 6 month, which has some minor consequences.
I'm flying back next week. It will be my first trip after almost 6 months here. I'll let you know how it goes.
Now, if somebody can tell me if Singapore IRAS shares info with US IRS regarding PRs that would be helpful
