FWIW, "Recents" is almost just as useless as its predecessor "All Files".
To begin with, you have absolutely no control over it, and it typically (but not in your case) it shows way too many files, anyway.
However, it is so easy to actually have what you want and need right there in the Sidebar.
That is what Smart Folders are for.
You can have one for, say, "PDF files created in the last week", or "Image files that were created this month and have names starting with Sand", or just any criteria that makes sense to you. Instead of looking for a needle in a haystack, you search for something meaningful to you and your search results are always up to date.