Do you want to see and do EVERYTHING- all of the rides, show, character meets? I am not a Universal expert but if the answer to that question is yes, then I am going to say 2 days won't be enough, especially without EP. My family just did two days last month (staying on-site, with the park hopper option). We were able to do everything we wanted, BUT we skipped A LOT (spider man, mummy, transformers, shrek, HRRR, the "kiddie" rides, the shows). If we had wanted to do those things, we would have had trouble fitting it all in. But then again, we rode FJ two times, Gringott's 3 times, Dr Doom and the barges 2 times each and my DD10 tried the rock climbing wall in IOA. We also went to all of the interactive wand spots. So, i think it all comes down to your touring style and want you want to do.