On my 1440px wide screen one line has about 200 characters (maybe 30 words) if I maximize my browsers. It’s not so much a problem with the scriptures site because every sentence gets a new line and every line is numbered but there can still be sentences which go on for several lines. Your eye (and neck) has to travel all that distance and then go back and hunt for the right next line which is harder the further you traveled.
The guideline is to have about 100 or so characters on one line.