Very sure, you will see on the I140 approval notice

回答: recipt date of I140 (NIW or EB1) or LC (normal EB2/3)NRG22006-10-11 13:53:16

It is counted from the start of the petition to immigrate, that is I140. I485 is just to adjust your status. So it is more reasonable to count from the date you your I140, rather than your I485.

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