We are given `hours`, a list of the number of hours worked per day for a given employee.

A day is considered to be a tiring day if and only if the number of hours worked is (strictly) greater than `8`.

A well-performing interval is an interval of days for which the number of tiring days is strictly larger than the number of non-tiring days.

Return the length of the longest well-performing interval.

Example 1:

    Input: hours = [9,9,6,0,6,6,9]
    Output: 3
    Explanation: The longest well-performing interval is [9,9,6].

Example 2:

    Input: hours = [6,6,6]
    Output: 0

Constraints:

- `1 <= hours.length <= 104`
- `0 <= hours[i] <= 16`