
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
The inflow of river water into Huacheng Reservoir is 200,000 cubic meters per hour, the evaporation rate during the day (calculated from 7 am to 7 pm) averages 1,000 cubic meters per hour, and at night (calculated from 7 pm to 7 am) it averages 250 cubic meters per hour. Starting from 12 pm on August 8th (at this time, the reservoir's water storage is 4 million cubic meters), the sluice is opened, and water is discharged at a rate of 230,000 cubic meters per hour until the water storage in the reservoir drops to 120,000 cubic meters. The time to close the sluice should be (the answer is rounded to the nearest hour).

Present the answer in LaTex format: \boxed{Your answer}
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