How to Log Your Time in GNU Emacs

• Create an .org mode file

• C-u C-c .
  

to create your starting time

C-u C-c.

to create your ending time, make sure the two times are in succession with the

--

operator in between then, then you can evaluate the amount of time the task took with

C-c C-y

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guidelines: https://orgmode.org/manual/Creating-timestamps.html