I can't tell you how often I rush through a task just to find I've made a mistake and need to do it again. Think of how much time I could have saved if I had done it right the first time. Consider if you are doing things as efficiently as you can . Perhaps learning some new concepts, methods, or procedures would help save a lot of time. In some ways, every minute does count.
Rest is important.
We need to make time for it in our busy lives without giving up what is really important to us. We need adequate rest in order that we can serve our Lord well.