In my case it took 18 days. It's not my style really and the answer was obvious for me

"Your Stocksy application was declined. Our editors felt that your images weren't what we were looking for in our collection. It was a difficult decision, but we only have room for a small group of contributors. We wish you the best in your future endeavours and we would be happy to look at your portfolio again in a few months.

Thank you for taking the time to show us your work."