For Product Design, I submitted an A3 portfolio of about 80 pages online and they gave me their offer without getting me in for an interview. At 80 pages, the portfolio that I submitted was dangerously close to going over their file size limit even after I went through every page and shrunk each picture's quality to make the overall file size as small as it could be. I'd guess if you didn't do that, you'd only be able to submit 25 pages, if even.