John McWade, founder and creative director of Before & After magazine, mentioned that the ideal line length is 45–55 characters without spaces and punctuations. For small mobile devices, the acceptable line length is 25 characters without spaces and punctuations. (If spaces and punctuations are included, the ideal line length will be around 66 characters according to The Elements of Typographic Style by Robert Bringhurst.) — How to Set Perfect Line Lengths for Your Webpages