3 if mariage-based green card. 4 if asylum-based green card. 5 for all other green card types.

The citizenship process start to count when you got your first green card. If you're married you can apply 2 years and 90 days after your first GC.... If you divorced 4 yrs and 90 days after your first GC

@josh bigosh , so that means a person after 2 years and 3 months of getting the marriage based GC can apply for citizenship ? i have seen your profound knowledge so i am compelled to ask . warm regards .

Basically, first of all check your GC issued date... Then, go to Google type uscis citizenship calculator. On the website you can see exactly when you can apply. But as lilo and I said. 3 yrs if marriage or 5yrs if divorced. But you can apply 90 days before. Thank you so much for your compliments.