Session duration 0.00 how is that possible?

Hi all! I started using google analytics a month or two ago. Then i forgot about it, then i checked it today.
Now the countries i have a lot of traffic from tne seesion duratin varies from 1-5 minutes.

But then there was a list of random countries i have had 1 'visitor' from each, who spent 0.00 minutes on the website giving an average of 0,00....

Sorry but if someone spent 0 seconds on the website how were they there. Is there something i am missing about google analytics?

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