We had two full days in the summer of 2014 (which I can't believe is three years ago already!). We did one park per day from open to close, and it was enough time to do everything we absolutely wanted to do with lots of extras (and one of our days was a Grad Nite so it was rather crowded). We skipped sit-down meals for time.
Okay, that is good since we are going in off season and spending the same amount as you in the parks.