How long to you hold eye contact?

I am wondering how most people deal with eye contact.
Hardly make eye contact, I am bad at that for some reason
Glance at their eyes for less than 5 seconds and then focus on something else, repeat
Look for 5-10 second and look away, repeat
Look for 10-20 seconds and look away
Stare into their eyes and don't let go until something else grabs my attention
Select gender and age to cast your vote:
How long to you hold eye contact?
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