How long can I apply for parents' immigration after marrying an American citizen?

Marriage immigration got a conditional green card first, and did not divorce after two years, becoming an ordinary green card.

You can apply for naturalization in two years and nine months from the day you get your green card.

If it goes smoothly for about a year, after being admitted as a citizen,

You can apply for your parents to immigrate to the United States.

But they need your financial security, and they can't enjoy welfare until they are accepted as citizens.

This was emphasized by Trump after he took office.