I asked several CMs this same question and only one took a guess at the answer. The one said he thought about 5000, but I think that's a bit on the low side.
We went 2 nights and both nights were pretty slow, most rides were walk-ons, the lines for pics, character greetings, candy were all short.
Hopefully someone will give you a better answer. I'd really like to know this one too, that's why I asked a lot of CMs, they just didn't know or aren't allowed to say for whatever reason.
Pammy