Changed: ALIAS dur1 { return $remove($gettok($regsubex($duration($1),/(\d+\w)\S/g,\t),1- $+ $2,32),$chr(32)) } ; by Raccoon
To: ALIAS dur { return $regsubex($gettok($duration($1),1- $+ $2,32),/(\d+\w)\D/g,\t) } ; by Raccoon

Thanks to Ouims for providing a moment of clarity.