<?php
$content = 'eneral';
$wordsPerMinute = 200;
$imgPerMinute = 6;
preg_match_all("~<img~i", $content, $imgTime);
$textTotal = round(count(preg_split("/s/", $content)) /  $wordsPerMinute, 1);
$imgTotal = floor((count($imgTime[0]) * $imgPerMinute) / 60);
$total = round($textTotal + $imgTotal);

echo ($total < 1 ? 'less than 1' : $total) . ' min';