Uso de "worth": hours' worth of, etc.

Por que "worth" foi usado na frase abaixo? Havia necessidade?
Though the longest missions can be completed in under ten minutes, there are hours' worth of challenging combat here and most missions can even be played solo for all you lone-wolves hungry for leaderboard glory.
Though the longest missions can be completed in under ten minutes, there are hours' worth of challenging combat here and most missions can even be played solo for all you lone-wolves hungry for leaderboard glory.
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