How many times can I use university discount?

See the information below (from Sales & Refund Policy at the bottom of http://www.apple.com/shop/browse/campaigns/education_pricing ):

Faculty, Staff and Students purchasing from the Apple Store for Education Individuals will be allowed to purchase the following quantities of product per academic school year. Not all products have special Education Pricing.

1. 1. Desktop: One (1) may be purchased per year
2. 2. Mac mini: One (1) may be purchased per year
3. 3. Notebook: One (1) may be purchased per year
4. 4. iPad: Two (2) may be purchased per year
5. 5. Display: A maximum of two (2) may be purchased per year
6. 6. Software: A maximum of two (2) per software title may be purchased per year