My doctor gave me a prescription of 90 pills to treat my anxiety. She told me to take 1.5 pills each day, then call when I need a refill. How many days will my Rx last? 

I want to set a reminder notice for when it’s time to call for a refill, so I don’t run out if medication. I am having trouble figuring out the math equation on this and the math subs keep rejecting my post.