I think that time goes on, and we don't really control what we do with it. The best we can do is manage a system in which we make the most of it, and with a shift in perspective: we can efficiently make the best of the time we are given in each moment to the next moment.

It is still important to have discourses about time management and asking ourselves if we are wasting our time. It still stands the test of time to me, that having said discourses are wasteful or not.

Mistakes are part of learning, so I think most people just label mistakes as points of time in which they were wasting. Always good to learn from mistakes, and to keep moving forward.