Depends on the guy- it can take an hour...a week...a few days...depends on how open he is about his feelings, what his personality is like (if he's shy it takes longer for me to know if I could like him) and how he acts around you :D
I thought attraction and chemistry was sorta immediate. Maybe you won't say I want to marry this guy right now, but you will be like a little more flirty.
hmmm that's possible too :) Since I'm just a teenager I've never felt that though :D For people who are older I bet that's the case sometimes though :)
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