OPK Question!! :) Help!

Taylor • Herbal Tea Sipping Yogi: Living at 7,000ft in elevation among the pines. Married. Mama. Artist. Happy.
Okay ladies, 
When is the best time of the day to take my ovulation tests? 
I have enough to test twice daily, for 10 days.... I just don't know what time to take them in the AM & PM?? 
Thanks!! :)