To convert liters to milliliters, we multiply by 1000: 3 liters = 3 * 1000 = 3000 milliliters.
Sandy drinks 500 milliliters every 2 hours, so in 1 hour she drinks 500/2 = 250 milliliters.
To find out how many hours it will take for Sandy to drink 3000 milliliters, we divide 3000 by 250: 3000/250 = 12.
Therefore, it will take Sandy 12 hours to drink a total of 3 liters of water.
#### 12
The answer is: 12
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
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?

### Answer:
