Setting the minimum length of hairpins

If hairpins are too short, they can be lengthened by modifying the minimum-length property of the Hairpin object.

\version "2.24.0"

<<
  {
    \after 4 \< \after 2 \> \after 2. \! f'1
    \override Hairpin.minimum-length = 8
    \after 4 \< \after 2 \> \after 2. \! f'1
  }
  {
    \repeat unfold 8 c'4
  }
>>