The USCIS stated processing times for EAD in connection with a pending Adjustment application is 90 days. According to the USCIS website, the 90 days is put "on hold" when you receive an RFE, and resumes when they receive your response. So it would be January 25 + 90 days + however many days it took you to respond to the RFE.
USCIS also lets you put in a service request for your EAD case if it has been pending for more than 75 days, but the same rule applies for RFEs. It's 75 days plus the number of days it took you to respond to your RFE.
Hope this helps!
