How to change or define this length?

Hi teams

After I follow this post.

https://devzone.nordicsemi.com/f/nordic-q-a/53909/sending-multiple-packets-at-every-interrupt-interval

And I modify my source code succeed.

The data was separate by 64 bytes?

How to change or define this "64" bytes in SDK15.2?

Please help me. Thank you.

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