Although it's somewhat too short for my taste, I generally comply with the conventional wisdom of having the summary line of git commit messages be no more than 50 characters.
Even using an editor that shows the current position of the insertion point (such as vim with set ruler enabled), it's not readily discernible how much of the available 50 characters remains, relative to text that has been keyed in so far.
My solution to this has been to set up a ".gitmessage" commit message template that includes a comment showing the 50-character limit:
# |<-- 50 char summary line limit
As long as my summary message ends before that vertical pipe character, I'm good!
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