Alissa folding it 3 times makes 2 × 2 × 2 = <<2*2*2=8>>8 pieces of note-size paper per letter-size paper.
So 5 pieces of letter-size paper make 5 × 8 = <<5*8=40>>40 pieces of note-size paper.
1 note pad would last 40 ÷ 10 = <<40/10=4>>4 days if someone wrote 10 notes a day.
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