Does anyone know how long you're supposed to fast for the 3 hour glucose test?

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I'm 30 weeks today and tomorrow I go do my 3 hour glucose test because I failed the 1 hour one last weekend. I stopped eating at 8pm tonight and I'm trying to figure out what time I should go to the lab in the morning to do it. I just can't for the life of me remember how long I'm supposed to fast for. Is it 12 hours?