Depends on the movie, they post schedules every Tuesday. Some movies have weeks in advance and some are only 2 weeks in advance. I tend to check every Tuesday if there is a movie I am waiting for them to open advance ticket reservations.
2-4 weeks, or the length of the run of the show
You can typically purchase tickets 2-3 weeks in advance. With some of the bigger titles this is sometimes extended further out.
It varies by movie booking. Go to Cinemark website, and when your movie becomes available, you can buy online or at Tue location. I have seen days to weeks in advance.
I have bought my tickets weeks in advance for a movie. It's so nice because you can choose your seats too!
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