[1letterunixname]

Line length with modern toolchains is too often stylistic bikeshedding with awkward limits stuck in 1975 cargo culted from the VT52. My external monitor can legibly display 637 x 81 while my laptop does 217 x 63. The largest barely legible terminals with tiny fonts are 3x the size.

Around 100 is a sane minimum while 160 is a sensible upper limit. There's no specific limit other than to prevent poor coding technique, illegible code, or inclusions of generated or minified atrocities.