Your car is equipped with an automatic oil life sensor that tracks your mileage and vehicle starts to determine when your oil needs to be changed. You can find out more about how this system works in your owner's manual. If you have misplaced the one that came with your car when you bought it, you can download a copy by logging in here at the Honda Owner's website: http://owners.honda.com/vehicles/information/2015/Accord-Sedan/manuals
If your sensor is telling you it's at 80%, then you have 20% left on your oil life. Depending on how much you drive every day, now might be a good time to call your dealership or regular mechanic to schedule a service.
If you don't have a regular mechanic, you can find an AskPatty Certified Repair Shop at http://www.askpatty.com/search/?type=all&m=30&q=&keyword= and they can help you maintain your Accord.