case processing times

[immquestion]

Hi

for the AOS case based on marriage with US citizen

I am getting the following time line for the Vermont service center

29 Months to 37.5 Months
U.S. citizen filing for a spouse, parent, or child under 21
March 19, 2018

I talked to the attorney he said it takes 6 to 9 months to get the green card. but the time line for 130 says 29 months to 37.5 months

please advice


Thanks