You must be new there. It is taking over a week for a review even when listed as "under review". I wish they would get rid of the ability to see the pending fields, they never match reality.

I could be wrong but I think they are listed as "under review" when they go to a reviewer (maybe in big batches?) but if the reviewer takes a weekend or more off they might sit in that state for a while. I have had images "under review" for at least a few days and have had other images get reviewed ahead of those sitting in that state before. If it goes much longer I'd ask DT what the status is.

I think I have also had images go from under review back into the time queue.

Update

They are not among Pending files anymore, but...I don't know where they went :/
Not in portfolio, not in Rejected files, not in Pending files...

Sometimes it takes a bit of time for files to appear - all sites occasionally have this problem.  I think "under review" means assigned to a reviewer.

Same here. A bunch of images is sitting "under review" almost three days. While SS and FT reviewed today just in a few hours after uploading.