Since there are 1000 milliliters in 1 liter, then 3 liters is equal to 3 x 1000 = <<3*1000=3000>>3000 milliliters.

She needs to drink 3000/500 = <<3000/500=6>>6 sets of 500 milliliters of water.

So, she will be able to drink a total of 3 liters after 6 sets x every 2 hours = 12 hours.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Sandy's goal is to drink 3 liters of water in a day. She drinks 500 milliliters of water every after 2 hours. After how many hours will she be able to drink a total of 3 liters of water?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
12
Sandy's goal is to drink 3 liters of water in a day. She drinks 500 milliliters of water every after 2 hours. After how many hours will she be able to drink a total of 3 liters of water?
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