The length of Shoe Laces can vary for different type of shoes.  The charts below are intented to be a "Guideline only" for standard shoes.  If you are replacing laces, try to measure the old laces as a reference.

Athletic shoe, Hiking or Work Boot Shoe Lace lengths.

Hole Pairs Shoelace Lengh  
3 or 4 = 27 inches
5 or 6 = 36 Inches
6 or 7 = 40 Inches
7 = 45 Inches
8 = 54 Inches
9 = 63 Inches
10 to 11 = 72 Inches

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Dress Shoe Laces
Hole Pairs Shoelace Lengh  
1 or 2 = 18 Inches
3 or 4 = 24 Inches
5 = 27 Inches

Hopefully, you found this guide to be helpful!