DO try and limit paragraphs to 40-60 characters per line
If a line is too long the reader gradually begins to lose focus and can often have trouble reading from one line to the next. If a line is too short it causes the reader’s eye to travel back too often, which disrupts their rhythm. This can also make them start reading the next line too soon, causing them to miss words from the previous line. This is why the optimal line length for body text is said to be around 40-60 characters per line. (via Do’s and don’ts of typography | Webdesigner Depot)