I think 80 columns is a bit narrow for modern monitors, but still lines shouldn't be excessively long either, so you don't waste screen real estate on vast expa

I think 80 columns is a bit narrow for modern monitors, but still lines shouldn't be excessively long either, so you don't waste screen real estate on vast expanses of white space. Something in the neighborhood of 100 to 120 columns is probably about right these days.