Helloooooooo?

NYTimes had an article today on email etiquette, which I always thought I was alone in: unanswered emails. The thing is with the internet is that despite its established reliability, there is always that concern that an email did not arrive due to misspelled address, rerouting to spam, or simple evaporation along the way.  

I would prefer if my emails are not ignored for too long - I recently had an somewhat embarrassing experience where I emailed a former classmate, and when I did not receive a response I asked another classmate if the address was still in use. I then received a response from the original intended party that the address was correct. But in the meantime I look stupid as I was obviously being ignored, or she could not take the ten seconds to send me an email.  

There should be accepted minimum of response time.