Why is SLIDING_WINDOW_LENGTH = 24?

[hsm207]

Why is SLIDING_WINDOW_LENGTH = 24 ?

In the paper, it is mentioned that the window is 500 milliseconds.

I don't see how setting the window length to be 24 ensures that its length is always 500 milliseconds.

[SqrtPapere]

indeed to obtain 500 ms windows (0.5 s), the length should be 0.5*30 (seconds * f_s) = 15