From a game theoretic perspective, hugging too briefly could be optimal. Even if the majority of people prefer a hug longer than 5 seconds, you might view the slight gain from having hugged them perfectly as not worth the risk that you creep them out.
On the other hand, one might consciously want to weed out people uncomfortable with a hug of that duration.
In the most abstract, game theory is the theory of how to interact when you don't know how who you're interacting with will respond. It doesn't imply competition or conflict, even if most common examples have that.
From a game theoretic perspective, hugging too briefly could be optimal. Even if the majority of people prefer a hug longer than 5 seconds, you might view the slight gain from having hugged them perfectly as not worth the risk that you creep them out.
On the other hand, one might consciously want to weed out people uncomfortable with a hug of that duration.
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