I have a document that has 1.8" left and right margins allowing me to adhere to the 65-75 characters per line rule which is considered to be the optimal line length for the human eye to scan. Leslie Lamport, the creator LaTeX, mentions it on this page: https://haroldpboas.gitlab.io/courses/math696/LaTeX-customizing-page-layout.html
My document uses the Charis SIL font at 11pt which is nearly the same size as the
"Times New Roman" at 12pt. Perhaphs the Charis SIL is a notch smaller but the added legibility of the Charis compensates nicely for the size difference.
The problem is that the left and right margins are large on A4 paper.
MWE
also...