Given an integer array hours representing time durations in hours, return the total number of index pairs (i, j) such that $i < j$ and hours[i] + hours[j] forms a complete day.

A complete day is defined as any total duration that is an exact multiple of $24$ hours.

Constraints:

• $1 \leq$ hours.length $\leq 100$

• $1 \leq$ hours[i] $\leq 10^9$

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