90 days from Receipt Date, not notice date
I am very sure that all INS offices have to give you the interim EAD when 90 days have passed after INS received the application.
(I went to the SF INS office on July 24 (RD 4/23, ND 6/20) and got my interim EAD, they were only interested in the EAD receipt notice and my drivers license, but bring all papers you have in your house..) According to the voice system, INS received the application on June 19, but that is wrong. The Automated Voice system is by the way not updated properly.)