my friend Charles Sommer, CEO of DoubleAgent, did a survey on his site of a bunch of women asking them how long a guy should wait to call them back. and the average time was, not surprisingly, 3 days.

but Charles then did a second-order analysis by age … and found that the time to wait was inversely proportional with age. 20 year old women wanted a guy to wait 9 days … 40 year old women were about 9 hours.