80 because it makes (several) vertical splits in vim and tmux useful. Anything more and things start wrapping in your editor. When composing email or commit mes

80 because it makes (several) vertical splits in vim and tmux useful. Anything more and things start wrapping in your editor. When composing email or commit messages I usually go with 72 (so you can indent by 4 spaces to center or quote it 3 times).