This depends on your font size and on your screen size. I can manage 230 columns with 14px Consolas on a 1080p screen, which is plenty for two 100-column docume

This depends on your font size and on your screen size. I can manage 230 columns with 14px Consolas on a 1080p screen, which is plenty for two 100-column documents, and almost enough for 120-column. And even if it won’t fully fit, most lines don’t reach the length limit, and for the remaining ones, in a two-file scenario, you could enable the soft word wrap feature of your editor, or just cut them off and scroll a little when absolutely necessary.