When you enter the US with this visa, you are issued with permanent resident status (green card).
The United States Citizen and Immigration Services website has a detailed page on maintaining permanent residence.
It states that you may lose permanent residence status if you are convicted of certain offences. It also states:
Abandoning Permanent Resident Status
You may be found to have abandoned your permanent resident status if you:
Move to another country intending to live there permanently
Remain outside of the United States for more than 1 year without obtaining a reentry permit or returning resident visa. However, in determining whether your status has been abandoned, any length of absence from the United States may be considered, even if less than 1 year
Remain outside of the United States for more than 2 years after issuance of a reentry permit without obtaining a returning resident visa. However, in determining whether your status has been abandoned any length of absence from the United States may be considered, even if less than 1 year
Fail to file income tax returns while living outside of the United States for any period
Declare yourself a “nonimmigrant” on your tax returns