<p>We are given <code>hours</code>, a list of the number of hours worked per day for a given employee.</p>
<p>A day is considered to be a <em>tiring day</em> if and only if the number of hours worked is (strictly) greater than <code>8</code>.</p>
<p>A <em>well-performing interval</em> is an interval of days for which the number of tiring days is strictly larger than the number of non-tiring days.</p>
<p>Return the length of the longest well-performing interval.</p>