One can feel joy strongly by 'hugging for more than 5 seconds'

Experiments have shown that the act of 'hugging,' which is also used as a type of greeting in some cultures, does not end in an instant, but that you can feel more 'joy' by continuing for more than 5 seconds.

The influence of duration, arm crossing style, gender, and emotional closeness on hugging behavior --ScienceDirect

Anna Dueren and colleagues, who study psychology at the University of London, conducted a survey to explore the effects of the act of hugging on human emotions. Dueren et al. Will conduct an experiment in which 48 female subjects are asked to hug in pairs and report their mood afterwards.

During the experiment, one of the pair was blindfolded as shown below so that the other person could not be seen. In this state, do two types of hugs, 'Neck-waist' where one turns the arm around the other's neck and 'Criss-cross' where each turns the arm around the back, for 1 second, 5 seconds, and 10 seconds, respectively. Subject was instructed.

The results of the experiment are as follows. The black bar represents 'Criss-cross' and the shaded bar represents 'Neck-waist'. It shows the result of hugging for 5 seconds and 10 seconds. From this result, it was shown that '5 seconds is just right' because 1 second is short and 5 seconds and 10 seconds are not so different to have the feeling of 'joy' by hugging. It was also suggested that there was little difference between the types of hugs.

Dueren et al. 'Hug 1 second for those who try to provoke excitement, 5 or 10 seconds for those who try to provoke joy or control.' 'This finding can be generalized only to women.' It's also important to consider in future research, as the strength of the hug may also affect the effect. '