
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
Given that the relationship between the pollutant content $P$ (unit: $mg/L$) of the waste gas and the filtration time $t$ (unit: $h$) is $P=P_0e^{-0.02t}$, determine the time it takes for the pollutant to decrease to $20\%$ of its initial content.

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