How long do you wait to call a girl?

You must start to know the person and start courting her if it is the right moment and right time. ANSWER Don't think in terms of the "right" thing or of manipulating the situation. Think in terms of honesty. If you are smitten and want to talk to her right now, call her right now. If you quite like her and would like to see her again, keep in touch and ask her out when it will work for you both.