Exercise 1: Checking "How Slow" From the Access Log — Possible Solution
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WHY THIS MIGHT NOT BE POSSIBLE
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Per this chapter, "neither Common nor Combined Log Format includes
response time at all." Both the default Apache and default Nginx
access log formats simply don't record how long a request took to
process - the field doesn't exist in the log line unless it has been
explicitly added.

WHAT NEEDS TO BE TRUE FIRST
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Per this chapter, response time has to be deliberately added to the
server's own log configuration before it will ever appear in the
access log: Apache needs %D (microseconds) or %T (seconds) added to a
custom LogFormat, and Nginx needs $request_time added to a custom
log_format directive. Without one of these already configured, "how
slow was it" simply isn't a question the existing access log can
answer, no matter how carefully it's read.

WHAT TO DO INSTEAD
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Per this chapter's own warning box, the very first step is "checking...
whether it's been added to the server's own log format configuration"
- confirming whether timing is actually being logged at all, before
trying to read a timing value that might not exist in the file.

WHY THIS WORKS AS AN ANSWER
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It correctly identifies that default access log formats omit response
time entirely, and correctly names the specific directives (%D/%T for
Apache, $request_time for Nginx) that must be configured before the
access log can actually answer a "how slow" question.