That's because January is not over yet but also because anything can be a temporal milestone if you want it to be.
They should be clear; they should be challenging; they should not be too complex (and should be broken into smaller tasks if needed); people should be committed to them; and people should receive regular feedback on how they are being accomplished.
You can also break big personal goals into simpler tasks, such as aiming to read one book per month instead of 12 in the whole year.
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