length can affect reading speed. If lines are too long it is difficult for the reader to quickly return to the start of the next line whereas if lines are too short more scrolling or paging will be required. https://en.wikipedia.org/wiki/Line_length Dyson, M. C., & Haselgrove, M. (2001). The influence of reading speed and line length on the effectiveness of reading from screen. International Journal of Human-Computer Studies, 54(4), 585-612.