I agree with you. Six seconds is a world. Three seconds, as well.

But, appart from the how long, there is something else to consider the how and the context.

Someone gave me a hug. I was uncomfortable but he only transmited me good energy. It was a thank hug bc I take my time to help him.

When someone has a problem I think about giving him or her a hug but what if I make them uncomfortable.
Perhaps, i'm wrong but I think Catholics moral made a lot of damage and it snatched what is in human nature.

Sorry if that sounds rude to people who are catholics. I'm sure there is a positive part in this belief but it's my opinion.