I think that "USED" to be the general rule for dating, but of course I also think it depends on what age you are and the era in which you were raised. Some people are different, old fashion, very blunt, shy, etc. Personally, I think if you hit it off with someone on the first date (since you can usually tell if the spark is there) Then, 2 minutes, 2 hours, or 2 days is fine! I say if you feel it and feel it's reciprocated, go for it!!