In this scenario, the store admin offers discount 15% for the product Adidas shoe for 10 days. 

Step-1:  General tab
Since the offers is going to be available for only 10 days,  you will have to mention the validity date here

For example,
Validity =  12/12/2017 - 12/22/2017

Step-2 : Condition tab

 Choose the product to which you wants to offer a discount and click Next.

Step-3 : Discount tab

Set the quantity range, discount type and value and click save rule.

Step-4 : Frontend demo

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