The ratio of speaking to listening in a conversation

So you heard a lot of people said you should listen more and speak less in a conversation. But what is more and what is less?
Me and my friend came up with an intersting ratio of talking to listening in a conversation last night.
Since we have a mouth and two ears, the ratio should be 1:2.
It means that we should listen 2/3 of the time during the converation and then use 1/3 of the time speaking.
Do you think it makes sense?

David Lorenzo offered his interesting metaphor of carrying a great conversation---which is "keep the ball going!"

Test this theory out in your daily conversation and see the difference!