Usual time line
A. apply for temporary green card - around 6+ months (biometrics, background checks, wait for uscis for appointment date, wait to receive green card)

B. after receiving temp green card - 21 months after you receive your temporary green card (expires in 2 years). Apply for permanent green card. Biometrics, MIGHT need another appointment, otherwise another 4-6 months to receive permanent resident card.

C. 2 years and 9 months AFTER the date you received your green card (first green card aka. temp green card) you can apply for citizenship. (biometrics, waiting period for biometrics, background check, and appointment for test. afterwards, they will either give you the oath ceremony appointment the same date, or mail it to you in a few days or weeks.

total time around 4 years. Of course this is only the optimal time, it would take longer if they think that your marriage isn't bona fide, then it will take you years to get the green card.