Forget time management. Try attention management
No matter what you do, time marches on at its own pace
tick, tick, tick. There's nothing you can do to change that (unless you can travel close to the speed of light). You can't manufacture time, you can't reproduce time, you can't slow time down, or turn it around and make it run in the other direction. You can't trade bad hours for good ones either. What you can manage, however, is your attention. Attention is a resource we all possess. Your attention reflects your conscious decisions about which activities will occupy your time. You are where your attention is, not necessarily where your body is.
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