The longest word you can type on the first row
On macOS version 12.1 Monterey:<p><pre><code>  $ grep &#x27;^[qwertyuiop]*$&#x27; &#x2F;usr&#x2F;share&#x2F;dict&#x2F;words | awk &#x27;{print length, $0}&#x27; | sort -rn | head
  11 rupturewort
  11 proterotype
  11 proprietory
  10 typewriter
  10 tetterwort
  10 repetitory
  10 repertoire
  10 proprietor
  10 pretorture
  10 prerequire
</code></pre>
On Debian GNU&#x2F;Linux 11 (bullseye):<p><pre><code>  $ grep &#x27;^[qwertyuiop]*$&#x27; &#x2F;usr&#x2F;share&#x2F;dict&#x2F;words | awk &#x27;{print length, $0}&#x27; | sort -rn | head
  10 typewriter
  10 repertoire
  10 proprietor
  10 perpetuity
  9 typewrote
  9 typewrite
  9 territory
  9 repertory
  9 puppeteer
  9 prototype</code></pre>