What is the time duration of the Nordic Bluetooth chip as it rewrites the Advertising Channel Indices?

[Allen Engel]

According to the BLE 5.0 Specification :

"The Link Layer shall use the primary and secondary advertising channel

indices as specified by the Host, and the used primary and secondary

advertising channel indices shall take effect when the Advertising State is

entered. 

So if I understand the spec correctly, with each advertising event, the Advertising Channel Indices are rewritten with each event.

Forgive my question, what is the time duration of this rewriting of the Advertising Channel Indices?  I guess that this occurs in less than 1 mS.  And that this rewriting is occurring concurrently with advdelay, the advertising delay inserted between each advertising event.  Advdelay is typically 10mS plus a random delay, if I remember the spec correctly.  Since it is concurrent with advdelay, I should just ignore the duration of the rewriting of the Advertising Channel Indices?

[Susheel Nuguru]

The advertising indices are written three times in every advertising event as fast as possible (if you have configured to use all three channels to advertise).  The time for rewriting the advertising index depends on the PHY (1M, 2M or CODED) and some pre and post processing after each radio configuration . Why do you need to know the exact time it takes for the index to change?