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According to this, the gemara compares Toch Kedei Dibbur (the length of time neccasary to greet someone; see Shalom alecha rebbi (u'mori) ) to the time it takes to walk 4 amot (cubits). Thus, with a little math, one can conclude that Toch Kedei Dibbur is 2.16 seconds.

Does anyone know what connection he is referring to? Where does the gemara equate these two units of time?

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The math in that post seems incorrect, incidentally: it divides the amount of time it takes to walk 2000 amos by 500 to obtain the amount of time it takes to walk 4 amos: but presumably most people will walk 4 amos at a faster rate than they will 2000. But that's neither here nor there. – msh210♦ Jan 2 at 23:34
@msh210 True but we usually multiply mil by 4 to get parsa even though people probably walk slower! I think it's meant as a fixed unit of velocity and we vary the lengths to get varying times. We will have to see the relevant gemara to see how well this particular application fits. – Double AA Jan 2 at 23:40
Actually, it may be that the poster there is incorrect and there is no such equation. I see where She'arim Metzuyanim Bahalachah (to Kitzur Shulchan Aruch 19:10) states that תוך כדי דיבור is less than כדי הילוך ד' אמות. – Alex Jan 3 at 3:50
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