My wife and I are trying to find out what is the minimum amount of time a green card holder must spend in the USA. She has been a green card holder for over 15 years.
We maintain a home there, pay taxes, 20 years now. Have a car, pay exorbitant health insurance. We are out of the country for 6 months or more a year although never consecutively. Generally we are never out of the country for more than 3 months, 4 max.
She has received a bit of static from officials recently when entering the US and is worried she may be denied entry one of these days.
Is there a minimum amount of time that she/we must stay in the USA to remain legal?