This article, with stick-figure drawings illustrating the point, conceives of each day as 1,000 blocks of ten minutes each. By considering time as quanta, it makes it tangible, and is a great tool to help a young adult consider time.
If you have a young adult in your life, you know how rewarding it is to offer them something they can use to improve their own life. This might be one of those, and if they accept it and integrate it, it could be an important one. And as you spend time sharing this concept and talking about it with them, you may find that time well spent.