Question about 802.11ax duration calculation

edit

As title, I see that Wireshark didn't have wlan_radio.duration information for 802.11ax.

Is there any reference or code can see for calculating the duration of 802.11ax?

What are the elements needed to calculate the 802.11ax duration from radiotap ? (or is the information in radiotap not sufficient to calculate the duration of 802.11ax?)

Thanks,