
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 the function $t=-144\times\lg (1- \frac {N}{100})$ representing the "learning curve" of typing practice, where $N$ represents typing speed (in characters per minute), and $t(h)$ represents the learning time required to reach the typing level $N(\text{characters per minute})$. According to this learning rule, the learning time required to reach a typing speed of $90$ characters per minute is ________ hours.

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