Their doors are open daily. You will find though that the office can be tricky to find. If facing the church main doors look to your left, take the walkway there, follow it back and when you see the small play structure between the two buildings the office doors will be on your left, head in and go upstairs.
You may want to try Tuesday.
Every day 7am to 10pm
I do believe there open all time... They are open right now.
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