The offer includes any cup size at any time of day, meaning you can order a large iced coffee during the morning rush. However, premium beverages like cold brew iced coffee, espresso, and cappuccino are not included. According to the company's estimation, you'll break even after using the service to purchase four cups of coffee. Drinks are non-transferable, so friends and family can't order under your account. You can get one free coffee every two hours.

So, here's how it works:

First, you have to be a member of MyPanera , which is free, before signing up for a subscription. Then, you can order coffee from the Panera app, in-store kiosk, online, or at the register.

But how much coffee is too much?

Knowing that you can purchase a new cup of coffee every two hours may tempt some people to drink more java. However, studies show it's best to consume no more than 400 milligrams (mg) of caffeine per day for adults. In other words, that's about four standard cups of coffee. Of course, the amount of caffeine is dependent on the type of beans you select.