I will have to say I just had my fastest sales  on Shutterstock today. I shot some photos around 3pm on Friday. I processed them later that evening and had them loaded to Shutterstock a little after midnight. I got e-mail notifications around 8am Saturday morning  that they had approved 20 of the 22 images that I submitted. Around 2:30 pm I check my sales  for the day and had one of the photos that was approved at 8am that sold. So I shot the photo, processed it, uploaded it, had it approved, uploaded to Shutterstock and sold it all within 24 hours

Yesterday was my personal record.
Under 6 hours since was photo online and already sold.
And yesterday was SATURDAY!
Oh, very important: SS "nazi" is on vacation!
Yesterday I have had good, old 90% + acc.  ratio.

Stared to create an illustration around 4.00PM
Keyworded and uploaded around 5.30PM
Approved 10.00PM before I went to sleep.
When I wake up today at 6.00AM, it's already SOLD, just for $0.36.