At what point is your eye contact good enough/mastered?

I've been practicing eye contact for the past few weeks. I don't have any problem holding eye contact with people I'm talking to/interacting with.

However, when I'm out in a public place, I sometimes hesitate to hold eye contact with people around me. If it's a really crowded place this is especially true.

My question would be, at what point can you consider your eye contact good enough?

I don't want to prematurely move on before I have really solid eye contact, but I also don't want to overly obsess and be impractical about