Time things that you commonly do. If you have to regularly do a particular type of work, then check how much time you need to do that. When you manage your time, you can allot that much time for it later on.
This is very important. In one of my articles I suggested using Toggl or Rescue Time for keeping track of how long things take. Knowing how long something typically takes allows you to ensure you aren't over-loading or under-loading your plate.
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