
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 Wuyang Ecological Company needs to drain a mountain pond to clear the silt for developing a sightseeing farm. It is estimated that using one pump continuously day and night would require at least 15 days. In practice, after using one pump for 3 days, another pump was added. How many more hours at least are needed to ensure all the water is drained? (Answer in whole numbers)

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