1pm
The first hour is zero hundred in military time and midnight to 1 AM on a 12-hour clock. So, the second would be one hundred hours and 1 AM to 2 AM, respectively. If we continue this, then the 13th hour of the day is noon to 1 PM (also denoted twelve hundred to thirteen hundred hours, but it's the same thing in both). That makes the 13th hour 12 PM, not 1 PM.
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climate
Since a day has 24 hours, each hour is 1/24 of a day.
That's six dollars for an eight hour day.
Once every hour, so 24 times in a 24-hour day.
"Day" always means 24 hours, at least on Earth. You take your Rx three times ... spaced as evenly as possible ... during whatever part of the 24-hour day you're awake.