How long do we need to hold eye contact with you for you to know we like you?

Anonymous
This is probably one of my biggest issues when it comes to getting girls. I have an extremely difficult time maintaining eye contact with anybody, let alone an attractive girl. If it's a stranger, I tend to look away almost immediately, and if it's someone I'm in conversation with I can hold it maybe 5-6 seconds on and off.

My question is, in both scenarios (in conversation as well as just some guy checking you out), how long would a guy need to hold eye contact with you for you to have a pretty decent suspicion that he's into you?
How long do we need to hold eye contact with you for you to know we like you?
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