Normally MF is one of the fastest MSCs I work for in turning reports around. Usually 24 to 48 hours, sometimes fewer. I've had one sitting in QC for three days, which is starting to worry me, especially since it was a fairly negative experience and resulting report. But maybe they're backed up because of the holiday? I guess I figured they were working on Monday, but maybe the U.S. folks got the day off?
I learn something new every day, but not everyday!
I've learned to never trust spell-check or my phone's auto-fill feature.
Negative report probably takes longer to approve since they have to allow the location time to possibly challenge the results. If you turn in a "negative" report, just be sure to keep accurate notes so that you can defend/clarify yourself should Quality Control come knocking. I have had QC requesting clarification/confirmation after the shop had already been approved. However, I have never had a report rejected by MF on the ground of it being negative.