Mine

sp {
  tokenize 32 $calc(1.024* $1) $2-
  if $2 {
    tokenize 32 $calc($$1) $calc($$2)
    if $isid { return $duration($calc(($$1 * 1000) / ($$2 * 1000))) }
    $iif($show,say,echo -a) Download of  $+ $bytes($calc($$1 * 1024000)).suf $+  at speed  $+ $bytes($calc($$2 * 1024)).suf $+ \s $+  will take  $+  $duration($calc(($$1 * 1024000) / ($$2 * 1024))) $+ 
  }
  else {
    tokenize 32 $calc($$1)
    $iif($show,say,echo -a) It's  $+ $bytes($calc($$1 * 1024000)).suf $+  
  } 
}