I made two shipment requests for economy rushed.
First request was on 11/30. Estimated ship date was 12/15, actual ship date was 12/11. USPS tracking hasn't updated since 12/18 and it hasn't been scanned to a distribution center or PO in my state yet, just "in transit".
Second one was on 12/8. Estimated ship date was 12/23, actual ship date was 12/21. It just arrived today, 12/28.
I'll chalk that up to the USPS holiday weirdness, but it sounds like COMC may have offered conservative shipping estimates and beat some of them by a bit. Or in banny's case apparently they pulled most of the people responsible for processing submissions and successfully created a time machine