If the GC holder obtains a reentry permit, then 2 years at a stretch and generally up to 5 total without issue.

Is a reentry permit a document that can be obtained by filing the I-131 form, or how can one obtain such a permit?

Could you spell out what "2 years at a stretch and generally up to 5 total without issue" means for non-native speakers?

That's right, the application is submitted using Form I-131. At a stretch here means a 2 year absence from the U.S. (without traveling back to the U.S.) and 5 year total means you could live abroad for 5 years without losing your green card (by getting reentry permits which can be issued for a total of 5 years).

Great, thank you

I have a GC and left a few months ago to Canada. Is it too late to get a reentry permit? I don't know if I want to return but having the option for 5 years would be nice.

ty!

You can only apply for a reentry permit while in the U.S. so if you wanted to get one, you would need to return to the U.S. and apply and then wait to be fingerprinted or depart and return to be fingerprinted. You then can remain outside while your reentry permit application is pending.