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Don\'t worry about that. It said 999 for mine. I got my I-485 approval within 6 months. They are just trying to cover their a@#.
VMS said that my I-140 should take between 180 to 210 days but it actually took over a year and half. Many people compalined, so they changed their message to say 999. I assume they had similar trouble with I-485 and they changed all the dates to the maximum allowable by the computer. It probably only had 3 digit limit or they would have put 9,999 days ;-)