Facebook might be one of the biggest sources of procrastination and time-wasting for most people — maybe even for you, too. If you were ever curious just how much time you might have spent (or wasted), Time Tech has put up a new calculator that will estimate how much time you’ve spent on the site.

According to the site, you don’t need to worry about the tool posting on your page without your permission or storing your data. With Facebook’s 10th anniversary just a week away, now is a great time to see just how much of those 10 years you spent on it. You can find the calculator here.

How much time did you spend? Post them in the comments!