Hard to say. If it's the same as last year, the Sunday will see Disneyland Park open till about 9pm, whilst Monday and Tuesday it'll be about 8pm. If you're staying at a Disney Hotel you might also be able to take advantage of Extra Magic Hours. The dates of those are announced 6 months in advance, whilst full opening times are announced 3 months in advance.
Thanks! Playing around on the official website, I found you can actually go back several months on the operating hours calendar. As you said, looks like generally 9-8; 9-6 for Studios.
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