Sound Check Question

I have read and heard a lot about the sound checks. So far I have only gone to one PJ show but I am going to 2 next week. When do the sound checks happen? I know before the show but how much before.
Thanks
Thanks
5/21/10 M.S.G
5/18/10 Newark
9/27/09 Philly Spectrum
5/18/10 Newark
9/27/09 Philly Spectrum
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No time to be void, or save up on life, you've got to spend it all
5/18/10 Newark
9/27/09 Philly Spectrum
Sammi: Wanna just break up?