56 columns, monospaced (with allowances for overruns to ~67 columns).

This allows rather large fonts, and adheres to typical print
media standards from 30 years ago for column width.

It also allows archival to other media (such as 80 column
text terminals) and it is a format that has worked well
for me, for decades.

Your example wraps at around 8-10 columns (but if you
hadn't done so I would not have noticed -- and did not
notice, initially!)

Good question.