It was not a full day for my family after the 1st time we went/ We then knew what we liked and didnt like and also with many attractions closing, it was definitely a 1/2 day.
On our last trip, I took advantage of this to sleep in a little later (rare on a Disney trip), have a later breakfast at the hotel, and spend some time at the pool. We headed over around 3, went on some rides/shows and had dinner at Hollywood and Vine (Fantasmic package) After dinner, we did some more attractions until Fantasmic started. It was a perfect day!
I will say, my family has zero interest in Star Wars, which would have added more time to our day...but we skipped all the Jedi things and parades/shows with Star Wars.