Statistical mechanics, bernoulli's forumula - collision freqency

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AirTycoon
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Hello,
I am having trouble understanding collision frequency in following discussion from Kubo,
Printed textbook page with the text of Bernoulli's derivation of gas pressure p = (1/3) n m v-bar squared, showing a cube vessel and the collision frequency |px|/2ml.


$$collision\ frequency = \frac{1}{\frac{l}{v_{x}}}=\frac{p_{x}}{ml}$$

What am I missing ?
 

Discussion

Between two collisions against the same wall, a molecule must travel a round-trip distance equal to twice the width of the container.
 
ah. I was counting the opposite wall too. Thank You.

ps. Should I close this thread now ?