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## some.host.name [ip: 111.222.333.444] is alive  70.05 ms)
## Updated: switched 'N' for 'd'; real data.
...
   my( $time ) = m[([\d.]+) ms)$];
   pack 'd A*', $time, $_;
} @data;

my( $time, $units ) = m[([\d.]+) (ms|us|secs)];
my $scaler = $units eq 'us' ? 0.1 : $units eq 'secs' ? 1000 : 1;
$time *= $scaler;