The size and resolution of the images vary -- it may be a reasonable size image at 300 dpi OK for printing, or much smaller at 96 dpi intended for screen display. Either way the ones I sampled were not great quality -- the edges of the selection [the people] could be much better -- so while OK for quick projects or the web, you wouldn't want to use them when/where quality mattered.
I logged into the site using Firefox. The images were in folders on Google Drive. Clicking the Download all button, all the files were compressed into 2GB ZIP files -- there were 7 2GB files & one at 86MB -- and then downloaded. Extracting the images from the ZIP files there were a few duplicates. My final total was 3396 files, 100 folders, 13.9GB.