Time Management is one of those things people spend lots of time trying to figure out. The reality though is that the clock keeps going regardless of your efforts. The only thing you can manage is yourself and how you use or invest the hours of your day.
Take a break
Surprisingly, you get more done if you’re rested and refreshed. Spend an appropriate amount of time sleeping, in recreation, and in activities that develop your mind and capacity.
What is most important to you? If you focus on this first, you’re more likely to accomplish that. If you are unfocused, time will fill up, but likely not with the most important things.
Lingering over decisions will slow progress, sometimes needlessly. I’m not suggesting adopting a reckless posture, but there comes a time when decisions need to be made. At that point, make it and move on.
I have heard it said that the dullest pencil is better than the sharpest mind for permanent recall. I carry a notebook with me almost everywhere I go. I also use EverNote as a tool on my phone so I’m rarely without some capacity to keep up with things discussed in a meeting. I’ve found that taking notes makes meetings much more productive. It also reduces the likelihood of needing to revisit things repeatedly.
This also makes the work fun. Delegation and teamwork will enable you to accomplish more with your time.