local duration=0

  if [[ "$1" == "-m" && -n "$2" ]]; then
    duration=$(($2 * 60))
  fi

  local count=0
  while true; do
    # shift arrow key down
    # osascript -e 'tell application "System Events" to key code 126 using {shift down}'
    # F-13 
    osascript -e 'tell application "System Events" to key code 105'
    sleep 30

    count=$((count + 30))
    if [[ $duration -gt 0 ]]; then
      if [[ $count -ge $duration ]]; then
        break
      fi
    fi

    # Print elapsed time every 60 seconds
    if (( count % 60 == 0 )); then
        echo -ne "\r$((count/60)) minutes elapsed\n"
    fi
  done
}