The number of days that it will last will be 4 days.
From the information, Harmony used discarded paper to make notepads for her friends and she would fold five letter size pieces of paper three times then cut along the lines.
Folding three times makes 8 sections or note size pieces of paper per letter size paper.
So, 8 sections x 5 papers = 40 note size papers.
As 10 notes per day is written, so it will last 40 / 10 = 4 days
Therefore, the answer is 4 days.
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