 that you follow what's called a 20-20-20 rule, which means 20 minutes on a computer, look 20 feet away, take 20 seconds break. I tell a lot of people who are software engineers or people who work on a computer pretty much all day to modify on that. You know, 20 minutes is a very short duration for most of them. So if you do maybe an hour, an hour and a half on a computer work,